Hey sorry to create yet another exhaust thread,

But me and my mechanic mate looked over my car recently, I've decided I could probably make do with the 2.5" system that comes with the Magna. Is this wise? Only changes we thought we really needed to make, was of course the rear muffler (replaced with a bolt on Lukey Ultra Flow), and a set of Pacemaker extractors. The system should be pretty nice after that.

Is this wise? Or is a complete 2.5" mandrel bent system worth the extra dollars? Installation cost is nil.

:D

The muffler will make it sound nice, extactors will give it a bit more power, but if its not going to cost you much for installation, get a cat back, mandrel bend piping, with the lukey high flow, it wont be loud, but it will have a very nice note to it.

This topic has been run so many times, but if you want to have a chat, just send me a PM, or get me on MSN. More than happy to help out if you need a hand mate.

John :cool:

The 3rd gen 3.5L exhaust is 60mm in diameter (2.3-2.4"). Some places will try and sell you a 2.25" 'performance' system. Tell them that the stock piping is larger diameter, and they'll tell you that your wrong....until they go out there and measure it themselves. So yeah, for a stock system is pretty damn good. The muffer is the big problem, and you will notice a huge difference once you put a straight through muffler on.

Personally, if were going for extractors and a new muffler, by the time you buy extractors, muffler and the flex, you might as well do the whole lot, particularly if install is nothing. It could be a good idea to get a high flow cat as well, the old one would probably be close to shot.

Mandrel bent is overkill unless you have big mods or flowing a lot more gas (turbos etc). I've seen reports that show only a 1.5% inprovement in gas flow with mandrel over press bent, which I doubt would register on a dyno. I wouldn't bother with it, nor with stainless steel. I don't plan to have my exhaust outlive me.

So there's bugger all, if any gain from a mandrel bent system? Cause I was planning on going mandrel bent once I get a few mods happening like oversized TB, cam work CAI extractors etc. But if there's bugger all gain over press bent then i'll go to my mate at the local exhaust shop and save myself a few hundred bucks. :)

Mandrel bent is overkill unless you have big mods or flowing a lot more gas (turbos etc). I've seen reports that show only a 1.5% inprovement in gas flow with mandrel over press bent, which I doubt would register on a dyno. I wouldn't bother with it, nor with stainless steel. I don't plan to have my exhaust outlive me.

Agreed, stainless steel is a bit silly unless you've won lotto. Looks cool though. But the majority of people have been recommending the mandrel bent system?

From these comments Im now more inclined to do the whole bloody lot at once...

Actually just spotted this good page from RPW of all people. It pretty much agrees with what I said.

With small mods mandrel is useless. Big mods are when you might need it.

http://www.rpw.com.au/Products/Exhaust%20Products/Exhaust%20Systems.htm

Almost certain the factory system is mandrel bent, so if you replace it with a 2.5" press bent system you could be going backwards.. just something to consider.

I just had a full 2.5" system fitted by MRT Performance in Sydney and the guys there said the same thing, Mandrell bends aren't worth the extra cost on mildly modded N/A cars. They could have tried to sell it but were quite honest I thought.

stainless is heavy

Almost certain the factory system is mandrel bent, so if you replace it with a 2.5" press bent system you could be going backwards.. just something to consider.

I got out under the car one day with some calipers and measured diameters. It's slightly narrower on the bends. Not by much though...only a few mm.

Almost certain the factory system is mandrel bent, so if you replace it with a 2.5" press bent system you could be going backwards.. just something to consider.

Thats a good point. However I too have jumped under my car and found that the system is not 2.5" all the through... at one of the bends I measured 2.3". Mandrel bending should eliminate this inconsistency. It's a press bent system Im pretty sure (without running outside to have a look at my car now).

By the sounds of it, the stock pipes should really do the job, but it really makes sense to do the cat, and if I'm gonna get the cat, it'd be easier to do the whole lot, mandrel bent.

Extractors, cat, muffler, new 2.5" press bent piping. Get it done this weekend me thinks.

:D

This is exactly what I plan to do in the upcoming months, minus the muffler (already have one). Let us know how it goes and the cost!

Goodluck!

If you wanted to save a few bob leave the stock piping, ditch the cat for an oversized one or one of the new 200cell highflows, get headers and a high flow muff. Press bends on large pipe if done over a large diameter don't distort obscenely. Tight bends will look messy next to straight pipe but seriously, the killjoys in the system are the manifolds, cat and muffler.

The only thing i didnt like about stock pipe was the two extra resonators. I just cut the things out when i did my exhaust. So if you do get custom bent piping minus stock resonators you 'should' flow a little more and sound a little sportier.

All i have is a standard piping wit the cat, Middle muffler and my cannon No Res and its a 2002 Tj series 2 And i found a lost in performance after removing my standard rear muffler. My cannon is a genie 5" barrel with a 4" tip so if i went Dual from the back wheels with tri-flow would i gain performance back or go dual stright thru, and mine is an auto, tippy


Cheers Brett:cool:

That's an odd one Brett.. you certainly shouldn't have lost performance if all you did is removed a tri-flow muffler and replaced it with a canon..

If you're going a dual system definately go dual straight-through.. not dual tri-flow, that's just nasty.

You might want to get your cat checked out. If it's collapsed it will be robbing your power.

A lot of people *feel* like they've lost power because it comes on so much smoother now, whereas before with the triflow, the engine would generate enuf power as it revved to overcome some of the final backpressure and hence the car felt like it 'came on power'. Yet to see a dyno-crusher with a tri-flow muffler :doubt:

might be a loss in back pressure

nor with stainless steel. I don't plan to have my exhaust outlive me.


stainless is heavy

stainless will give a slightly different note and isn't that much heavier

If I want a better note, I'll spend the $200-$500 on another 12" sub. :D

Hahaha, yeah, I'll buy a new guitar.

No work done on the car yet... as always, time and money are the limiting factors. Bloody christmas. Got some free time in January though, so me and a mate will fit everything up one weekend in Jan.

I havent bought the extractors yet... at this stage my wallet is leaning towards the pacemaker set. Heard they dont perform as well as the RPW ones, but I'm guessing as I'm never really going to do cams/turbo/anything extreme, the difference will most likely be neglible.

Hope they fit - esp if you're doing the header install at home! We've bought and installed about a dozen Hurricane headers (that's the brand RPW sell) and we have had to cut and shut EVERY set we've bought. Even being trade doesn't get us a very good price on them either :doubt:

Pacemakers also need work joining to the cat. Wildcats are a direct bolt-up but are press bent. Ask MYV64U about his Wildcats, he noticed a credible improvement, which shouldn't be too hard considering the stock lumps ;)

Good luck!

Hope they fit - esp if you're doing the header install at home! We've bought and installed about a dozen Hurricane headers (that's the brand RPW sell) and we have had to cut and shut EVERY set we've bought. Even being trade doesn't get us a very good price on them either :doubt:

Pacemakers also need work joining to the cat. Wildcats are a direct bolt-up but are press bent. Ask MYV64U about his Wildcats, he noticed a credible improvement, which shouldn't be too hard considering the stock lumps ;)

Good luck!

Yeah, been eyeing off the wildcats, once everyone reopens I'll get someone to pop em in the mail to me.

Not looking forward to making them bolt up to the extractors though, but I knew from the start there was no way around it.

the standard 6g74 exhaust is actually very good. unless you're chasing every last kilowatt it really doesn't need changing. changing the rear muffler will give you the desired exhaust note and save you a bundle.

the standard 6g74 exhaust is actually very good. unless you're chasing every last kilowatt it really doesn't need changing. changing the rear muffler will give you the desired exhaust note and save you a bundle.
Are you high? The stock muffler sux and the factory lump headers are disgusting. When I see them I never hear words like "tuned length", "equal length primaries", "well formed collector" enter my head. Usually I hear "what the fnck", "cost cutting", "aftermarket" and "kill them, kill them all" :shifty: . See - not all the voices in my head are talking about cars ;)

Are you high?

:bowrofl:

Having owned the car for a few weeks now, there isn't very much at all the exhaust has impressed me with. Except maybe the stock piping.

The stock piping, which is as small as 2 1/4" in some places.

But hey, the triflow sure 'looks' kinda cool!

the standard 6g74 exhaust is actually very good. unless you're chasing every last kilowatt it really doesn't need changing. changing the rear muffler will give you the desired exhaust note and save you a bundle.

Yeh mate actually go have a good look at the system and go compare it to some higher priced vehicles big difference! Im also looking at wildcat extractors if they are a direct bolt on seems like the way to go! Does anybody have any good advice on what sort of cat and muffler i should fit for minimal mods that lie within a reasonable price range? With my system i plan to run a split from behind the muffler to hav either twin 3" tips on either side or single 4" on either side. so a shorter muffler would probably be the best idea for me i think to allow for easier flow to both sides instead of at the moment i have to pretty much run a right angle!

A lot of people *feel* like they've lost power because it comes on so much smoother now, whereas before with the triflow, the engine would generate enuf power as it revved to overcome some of the final backpressure and hence the car felt like it 'came on power'. Yet to see a dyno-crusher with a tri-flow muffler :doubt:

i felt power loss 2 when i put a straight flow muffler on my TH it just revved quicker and smoother than my TJ magna with the tri flow muffler you can tell the difference so much in first gear. The guy hew did the exhasut on my TH he said the tri flow mufflers on the later model magnas arnt bad at all. Has any one got proof of a 8kw gain from a straight threw muffler

A straight through muffler is the only difference between a 155kw exec and 163kw vrx.

An engineer at my work was an engineer at Walker and also had a lot to do with designing/testing the magna exhausts. If theres someone to believe, its the guy that designed the bloody thing, rather than a shop (some of which claim to have designed the vrx exhaust themselves *cough cough*)

i felt power loss 2 when i put a straight flow muffler on my TH it just revved quicker and smoother than my TJ magna with the tri flow muffler you can tell the difference so much in first gear. The guy hew did the exhasut on my TH he said the tri flow mufflers on the later model magnas arnt bad at all. Has any one got proof of a 8kw gain from a straight threw muffler

I fail to see how removing the most restrictive part of the entire system will do any harm at all.

A straight through muffler is the only difference between a 155kw exec and 163kw vrx.

An engineer at my work was an engineer at Walker and also had a lot to do with designing/testing the magna exhausts. If theres someone to believe, its the guy that designed the bloody thing, rather than a shop (some of which claim to have designed the vrx exhaust themselves *cough cough*)

There was also a little bit of ecu tweaking

Received the pacemakers today. Still looking at mufflers... I think I'm going to leave the stock piping on the mid section. I'm undecided though, cause I want to kill the cats... Anyway, I'm taking Thursday off to do it all.

Pacies are on! We wacked em on today, bit of f***** around with the flex pipe (I havent welded for a while, altohugh in the end I ended up gettin it to just bolt up, haha), and serviced my car while it was stationary, so I ran out of time to put the muffler on. Pics galore tomorrow when it's all done.

Can't wait to drive the bloody thing!

:D

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_7_full.jpg

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_8_full.jpg

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_10_full.jpg

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_9_full.jpg

which muffler? looks like it suits well :cool:

Mantra do a 2.5" system for Magna's, so we used that as a starting point. The only brand name that came on the packaging was Mantra, so I'm assuming that's what it is. Heavy bloody thing anyway. Nice big pipes round the mid to rear section. Cut out the mid section muffler, and it's ****!n loud. Very raspy too! Makes an incredible difference to dirving, power is avaiable as low as 1900rpms righ up through until about 3750rpms. Throttle is much more responsive as well actually, suprsingly!

edit: It's possibly a redback system, but I only had a part number when I ordered it so I wouldnt have a clue.

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_7_full.jpg

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_8_full.jpg

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_10_full.jpg

http://memimage.cardomain.net/member_images/12/web/2184000-2184999/2184691_9_full.jpg

awsome youll have to do a recording or a sound clip of the exhaust love to hear it

I'll try to get one after work for ya mate! It's very, very raspy. Mates reckon they can hear it coming from around 2 blocks away, so I'm pretty ****in happy. Oh, but at crusing at 110km it drones to the shiznit, but meh, I'll live.

Wish I could have done a dyno run before and after, cause **** it's a lot nicer to drive now!

Is someone able to confirm that this is 'redback' piping/muffler?

The only brand name I remember seeing was 'Mantra', and as I didn't order the parts in myself (mate at carline did, and he has no idea... mainly because he's really only supposed to stock lukey/walker shizzle) I'd like to find out.