I'm buying a hiflow cat for my AWD rada next week. I know that there is an O2 sensor on the y pipe. but just needed to know if the stock cat has this aswell?. unfortunately getting under my car is a bit of a challenge and I can't get to the heat shield to remove it and see if there is one there as I don't want to buy the wrong item.

My second question is in regard to max resonator length that can be used in the AWD's. Mon's got a tiny 4" resonator after the cat and a longer 12" second resonator before the rear muffler. Magnaflow make 14" resonators and I wanted to know if anyone has had any success installing one of these or longer ones. It seems that because of the limited space in the AWDs plus the main pipe having what seems to be a 15° bend that using a long (18" or 22") resonator seems out of the question? I've already purchased the large body magnaflow rear muffler (same size as the stock) but I don't want any drone and as little rasp as possible. I understand that the system will be a tad louder when it becomes a steaight through with a hi flow cat. I just want the system to sound deep & sporty.

Any advise would be appreciated.
Cheers.

You have plenty of straight pipe after the cat for a longer resonator but the factory one is straight through and replacing it won't do anything but make your exhaust quieter.

Only 1 sensor and that sits before the cat. Any hi-flow weld in cat will work.

I don't mind a quietish exhaust ;) and no the exhaust system on my RADA is not straight through (not the rear muffler) and it does have 2 resonators.

I was thinking of getting the weld on 200 CPI spun metal cat and flanging it which would create enough room theoretically to fit a 14" magnaflow resonator and if need be, add an additional 6" magnaflow race resonator before the rear muffler (which would replace the stock 12").

I'll get my fabricators to prep a stainless system for me as I can buy the tubing cheap enough through work. I just needed to get some things cleared up like the o2 sensor (which Hayden answered- thanks).

I am of the uninformed opinion that this set up would still be louder than stock but well within noise limits and will give me the kind of power and sonic upgrade that I am looking for.

Just trying to get some ideas from people who have installed these or similar.
Anyone with an AWD and upgraded exhaust system offer some insights?

Have sent you a link with some pics of the underside of my AWD so you can see what I managed to fit in there.

Thanks for that. the link was very helpful. just a quick question. is the cat you had fitted in the pics a 5" round? I was hoping to get a 5" round cat under there. I already have the hm perry headers and y pipe fitted. the rest of the system inc engine is stock for now ;)

Just a bit of advice mate.
After spending thousands on exhaust mods and countless days wasted at exhaust shops, I found the best setup for the AWD is using HM headders, stock after that inc stock cat, and just have the genuine sports muffler on. ( single outlet ).
Anything other than that will make it loud, give it an annoying boom and will make it sound terrible and raspy.
I put a hi flow cat on and it made no difference at all other than making it sound worse.

Well that's promising, cause I'm getting a 6G75 conversion done on my TW AWD in a couple of weeks with HM Headers (already ordered) and stock cat-back. I want it quiet as.
Spending thousands on exhaust mods would only pay off if you got a tune as well.

Yeah had a 98 skr tune as well as ralliart cams. That's the perfect combo munkyman. You won't better the sound or note.
After all the time and money I spent and wasted on the exhaust I ended up going back to stock with the HM headers and genuine sports muffler.
I know the temptation is there to mess with it but you won't better the stock note/sound. The AWD is a very hard system to get sounding tough or nice.

Oh yeah and included in that time and money wasting was dyno runs and once again, no improvement messing with exhaust. The only thing that improved power outputs was HM'S and sports muffler.

Anything should sound good as long as you have 2 resonators and 1 rear muffler.. Just make the rear muffler small if you want it loud or big if you want it quiet.
It's when people take out middle mufflers/resonators the cars get raspy.

The AWD magna stock exhaust sounds quite good actually. It's a much tougher sound than the FWD exhaust system! Pretty much silent at low RPM and has a nice howl to it at around 4000rpm but not stupidly loud. The AWD sports muffler just emphasizes that awesome sound :)

I know what you're saying FamilyWagon. I played around with many different cat-back exhausts on my TE and they all sounded loud but not beefy enough. Any exhaust mod is only gonna reduce your power/performance unless it's done properly with a tune. But hey it's a learning experience, makes more sense if you try it yourself!
I'm really looking forward to my 6G75 and HMs :)

Thanks for the input guys. I might just stick with putting on the magnaflow muffler that I already bought. same size as the large stock rear muffler. Only straight through and polished stainless. Like I've mentioned before, I've already got the HM perry headrrs and Y pipe fitted so that should finish off the exhaust upgrade nicely and I'll worry about a hi flow cat when the fumes start to smell like rotten eggs.

Cheers.

Well that's promising, cause I'm getting a 6G75 conversion done on my TW AWD in a couple of weeks with HM Headers (already ordered) and stock cat-back. I want it quiet as.
Spending thousands on exhaust mods would only pay off if you got a tune as well.

Hi is this something i too should look in to thanks.

HM Header's should i get some installed will it be worth it. :) i wanna do something to the car.

Update.... Got the Magnaflow model 14586 fitted this week.
Magnaflow muffler
http://www.magnaflow.com/02product/displayapplications.asp?partnumber=14586

HM Perry headers & Y pipe
http://www.hmheaders.com.au/shopexd.asp?id=178&bc=no

It's a polished S/S oval straight through muffler designed mainly for small trucks & SUV's but is near identical dimensions to stock Magna/Verada rear muffler.

Sounds much beefier especially at higher rpm without being any louder at idle or lower revs & only marginally louder under load & higher rpm which I am stoked about.
Great thing is that although the exhaust note has changed, it isn't at all raspy. Just fatter, as deep as stock turning into a deep wail at WOT.
So it's perfect if you're wanting a straight through muffler that's still reasonably quiet.
So I'd have to agree with your comments Munkeymanz.

Thank you also Familywagon for your advise, it was spot on and I did exactly what you'd recommended.

My Exhaust system is now HM Perry Ralliart headers & Y pipe with the Magnaflow 14586 high-flow S/S muffler fitted.
That's it and overall I'm very happy with the performance and sonic upgrade. without dynoing the package, overall I'd say around 5-7 kw. Not a huge increase, but at least it's noticeable across the rev range (mainly higher up) , but also a little down low which is important for AWDs as they are a bit sluggish down low stock.

Congrats on the HM Header purchase. The HM Headers together with the free-flow muffler would have brought the power at the fly to be slightly more then stock FWD VRX.

Btw, how much were the headers. I got mine for less than $500 a long time ago.

HM headers & Y pipe for $495 a couple of years ago. Yeah definite power increase, like I said about 5-7 Kw for headers & free-flow muffler which is pretty standard power hike for that type of upgrade.

In saying that, the headers made a more noticeable improvement with regards to off idle throttle response even though they are only good for a 1-2Kw power increase on their own. So low end torque would be the big benefit of the HM's with the Magnaflow freeing up more power in the mid to top end.

@ Munkeymanz - Pity the stock AWD exhaust note sounds tougher than FWD & but produces slightly less power & torque :(

I believe that was because of the exhaust headers? With HMs you gain back that extra 1KW and 6NM. Otherwise it's all completely irrelevant once you get a 6G75 motor installed plus a tune!

I believe that was because of the exhaust headers? With HMs you gain back that extra 1KW and 6NM. Otherwise it's all completely irrelevant once you get a 6G75 motor installed plus a tune!

Yes the stock Y pipe in the AWD was a bit of a joke. Basically a mild "S" shape pipe bend with the opposing pipe bunged on the main pipe to make a "Y" shape. No wonder it didn't flow as well as the FWD (I had an '02 TJ Magna exec before the AWD Rada and it was quicker off the the line, even with the 4 speed auto)

It's hard to say given that I don't have the 2 to compare anymore but I still think that the FWD TJ exec would've still been quicker- but then that's the compromise with the AWD. Better traction & handling at the expense of some straight line punch (AWD's bog down too much at launch, even with INVECS II 5 speed Auto) and worse fuel economy also due to greater rolling friction and a porky 130kg weight gain.

I'd consider a TT6G75 when the rolling stuff becomes more readily available. But for now, I'm considering an RPW inlet manifold, throttle body upgrade & a 98 RON tune with Ralliart ECU reflash.

ADM where did you get the ''Magnaflow model 14586'' from and how much did you pay?

ADM where did you get the ''Magnaflow model 14586'' from and how much did you pay?

from Flea bay Motors (USA) $ 196 delivered to my door with USPS. You can buy these in Oz but local online performance shops and retailers usually ask for $320 or so.

You can also try amazon: http://www.amazon.com/Magnaflow-14586-Polished-Stainless-Muffler/dp/B000XQO14W

But you'd have to check that the seller ships international & ask for a shipping quote (USPS is the most popular - takes approx 2 weeks to Australia from the States).

from Flea bay Motors (USA) $ 196 delivered to my door with USPS. You can buy these in Oz but local online performance shops and retailers usually ask for $320 or so.

You can also try amazon: http://www.amazon.com/Magnaflow-14586-Polished-Stainless-Muffler/dp/B000XQO14W

But you'd have to check that the seller ships international & ask for a shipping quote (USPS is the most popular - takes approx 2 weeks to Australia from the States).

Thanks mate.

Yes the stock Y pipe in the AWD was a bit of a joke. Basically a mild "S" shape pipe bend with the opposing pipe bunged on the main pipe to make a "Y" shape. No wonder it didn't flow as well as the FWD (I had an '02 TJ Magna exec before the AWD Rada and it was quicker off the the line, even with the 4 speed auto)

It's hard to say given that I don't have the 2 to compare anymore but I still think that the FWD TJ exec would've still been quicker- but then that's the compromise with the AWD. Better traction & handling at the expense of some straight line punch (AWD's bog down too much at launch, even with INVECS II 5 speed Auto) and worse fuel economy also due to greater rolling friction and a porky 130kg weight gain.

I'd consider a TT6G75 when the rolling stuff becomes more readily available. But for now, I'm considering an RPW inlet manifold, throttle body upgrade & a 98 RON tune with Ralliart ECU reflash.


Save your $$ & grab a set of ralliart/ 380 cams instead. The cost of the cams plus fitting will probably be similar to the cost of the manifold & will net you far better results. An SKR tune, rather than a Ralliart tune is what you should be chasing as well as it will be a 98 tune.

Save your $$ & grab a set of ralliart/ 380 cams instead. The cost of the cams plus fitting will probably be similar to the cost of the manifold & will net you far better results. An SKR tune, rather than a Ralliart tune is what you should be chasing as well as it will be a 98 tune.

Cheers Alscall. I'll check out that option as a first to do.

GIven this in an AWD, getting a set of adjustable cam sprockets (aka vernier cam gears) would allow you to adjust the power delivery to boost the torque lower down in the rev range. Noticeable (but not dramatic) gains with the stock cams but more effective with the Ralliart/380 cams.

I ran a vernier setting of +2 with the stock cams, and am running a vernier setting of +4 with Ralliart cams. +3 might be a better vermier setting with the Ralliart cams if you like to rev the engine lots. Fidanza cam gears (search these forums for the part numbers) are popular, and readily available - a fair bit cheaper if you buy from the US though.

GIven this in an AWD, getting a set of adjustable cam sprockets (aka vernier cam gears) would allow you to adjust the power delivery to boost the torque lower down in the rev range. Noticeable (but not dramatic) gains with the stock cams but more effective with the Ralliart/380 cams.

I ran a vernier setting of +2 with the stock cams, and am running a vernier setting of +4 with Ralliart cams. +3 might be a better vermier setting with the Ralliart cams if you like to rev the engine lots. Fidanza cam gears (search these forums for the part numbers) are popular, and readily available - a fair bit cheaper if you buy from the US though.

Did a keyword search on the forums for Fidanza but I couldn't find anywhere which listed the part number specific to the 6G74 engine. Checked out their website & it seems that it would either be part # 161001 (3.0 ltr '90-'99 3000GT N/A) or part # 161241 (Eclipse '06 - '07 3.8 Ltr) ??

Any help on what part number would be appreciated. Cheers.

*** update *** found the Finanza Cam gears part # 961639 (blue) / 961636 (red)

You can get them from here for $99each http://www.importperformanceparts.net/

You can get them from here for $99each http://www.importperformanceparts.net/


Excellent. thanks for that ;)

Excellent. thanks for that ;)

No worries.