i am looking at getting a new muffler, but i just wanted to check what size exhaust ralliart magnas have.

2.5-2.75" ?

60.5mm ~ 2.4'

Dual 4inch tips rule...:P

2.5 systems are common aftermarket and seem well suited to the 3.5. 3" will flow more at higher rpm, but would benefit from good headers as well - as any system upgrade would.

Dual 4inch tips rule...:P

Go the milo tin!

I'll be upgrading to pacemaker extractors + full 3" exhaust system with dual pipes. Just as soon as I can afford it. :bowrofl:

I'll be upgrading to pacemaker extractors + full 3" exhaust system with dual pipes. Just as soon as I can afford it. :bowrofl:


3" really isnt worth it, your basically going to be getting the same flow out of 2.5" its not the piping that is restictive it is the cat and muffler

Go the milo tin!

Oi.. there are only mimi milo tins..:P

Just a quick note......RPW have had some decent performance gains using 3 inch over 2.5.......BUT bearing in mind this increase was working together with a number of other mods. It really depends on what your car can take advantage of, I would go with three inch for highly tuned N/A (cams, computer etc) and forced induction. Other than that im sure 2.5 would be enough, even with breathing mods etc

if ur going to do 3" mite aswell go 4 or even 5".........

2.5 is the way to go, with dual mufflers with 3" twin tips on each side which makes it Quad Exaust......

My comments are not based on personal opinion, its based on dyno testing conducted by RPW. Take it or leave it.

3" really isnt worth it, your basically going to be getting the same flow out of 2.5" its not the piping that is restictive it is the cat and muffler

It is, actually. I read up on the RPW website and they found that 3" gives a bit more @ high end revs, and also it will be beneficial later on when I add more mods to the car like cams etc, and maybe Twin Turbo way down the track. For now there is no loss of power, only gains for when further mods are added.

Taken from RWP website...


The fourth and final option is that RPW has found that upgrading the whole system to a complete 3" system ie 3" cat converter, resonator, muffler and piping mandrel bent whilst does not on a fairly stock motor increase horsepower over the above 2 1/2" system, nor did it lose horsepower or torque. We have found the vehicle to be non - responsive in this size meaning that either sizing works well. The 2 1/2" system tends to be slightly quieter. But if you are planning on doing more work later being camshafts, twin throttle bodies, internal engine work etc then the 3" system is definitly the way to go to bring it in line with future mods. And since there is no loss of power over a 2 1/2" system its the perfect way to go.

So that's what i'll be doing. Full 3" split into dual 3" tips @ the back.

Aparrently the 3" system sounds a bit nicer as well.

let me just point out that your car isn't turbo. nor is it a V8 so by going into a 3" sized piping you will lose a lot of back pressure n therefore lose a lot of potential power. the best size to go is 2.5" into a 2.5" or 3" muffler. this way you will keep constant back pressure and still have a nice sound. i used to work for an exhaust shop if your wandaing why i just budded in and everytime i see a thread about exhaust and a hole bunch of pple feeding the poster crap about what they should do i have no choice but to bud in and help b4 sumone leads them down the wrong track. i have a dual exhaust system and its 2.5" in to dual 3" muffs and it sounds awsome and goes crazy. so you wont go rong by going for a half inche diamater smaller piping

Well, several people have proven gains and no losses with a 3'. I'd say it could be a bit drony. That's what a NT member has found.

Well, several people have proven gains and no losses with a 3'. I'd say it could be a bit drony. That's what a NT member has found.
well as i said its a common knowledge in the exhaust buisness that you dont do 3" on a non turbo/blown/v8 car as it can lose POTENTIAL power. you will still gain but there is more to gain from a 2.5" system as it is better adapted for that engine

well as i said its a common knowledge in the exhaust buisness that you dont do 3" on a non turbo/blown/v8 car as it can lose POTENTIAL power. you will still gain but there is more to gain from a 2.5" system as it is better adapted for that engine
Just a side Q. Is the quoted dia of tubing used an internal or external dimension?

Just a side Q. Is the quoted dia of tubing used an internal or external dimension?
on the muffler the diameter is 2.5" inlet with 3"internal pinping

EZ Boy is making me a custom set of extractors that leads into a 3" pipe, 3.5" cat then 3" mandrel bent all back with a cannon at the end, if any exhaust is going to make a 3.5L scream this will.

EZ Boy is making me a custom set of extractors that leads into a 3" pipe, 3.5" cat then 3" mandrel bent all back with a cannon at the end, if any exhaust is going to make a 3.5L scream this will.
dnt say this thread didnt warn you. itll sound good maybe itll have a boost in power but theres more in a 2.5"

welll now after looking at the back od my car a single 3" tip would look small so i am thinking about twin 3" twin tips, with a 3"muffler so if one day if it is found to be better i can change and not need a new muffler.

or do you still think got the 2.5"muffler with twin 3" tips

but my first question was, what is the size is a stock ralliart exhaust is. is it 2.5 inch.

welll now after looking at the back od my car a single 3" tip would look small so i am thinking about twin 3" twin tips, with a 3"muffler so if one day if it is found to be better i can change and not need a new muffler.

or do you still think got the 2.5"muffler with twin 3" tips

but my first question was, what is the size is a stock ralliart exhaust is. is it 2.5 inch.
the second one will be ideal choice. 2.5" inlet with 3" muffler inside piping the tips will suite the car tops too. and i think the ralliart came out wit 2"1/4' piping

but my first question was, what is the size is a stock ralliart exhaust is. is it 2.5 inch.
According to MMAL it's 60.5mm ~2.4'. It has the same piping as any other 3.5l.

welll now after looking at the back od my car a single 3" tip would look small so i am thinking about twin 3" twin tips, with a 3"muffler so if one day if it is found to be better i can change and not need a new muffler.

or do you still think got the 2.5"muffler with twin 3" tips

but my first question was, what is the size is a stock ralliart exhaust is. is it 2.5 inch.
hey pete
The xforce mufflers sound really good, both myself and ralliartboy have them on our ralliarts. The stock pipe on a ralliart is 2.5 inch which i believe is the same as a vrx. The twin 3 inch tips would look awsome on your car, otherwise you would need a 5 inch single tip to fill up the gap in the rear bar.

I suggest the xforce muffler with the twin tips. Go down to cortus exhaust on bassett street mona vale (nice and close to you) and speak to the guys there about it. Im sure they can get the muffler in and install it at a reasonable price

thanks mate i went down there a few days ago and thet said about $300 with muffler installed but it wasn't an xforce or stainles, do you have any idea what the xforce mufflers are worth.

thanks mate i went down there a few days ago and thet said about $300 with muffler installed but it wasn't an xforce or stainles, do you have any idea what the xforce mufflers are worth.
no i dont mate, but a $300 muffler installed wouldnt be all that crash hot. You'd prob be looking at aroud the 500 mark for a stainless muffler installed

no i dont mate, but a $300 muffler installed wouldnt be all that crash hot. You'd prob be looking at aroud the 500 mark for a stainless muffler installed
and on that note i suggest you go and get a cat back system done cause youd be looking at roughly the same price. you can have just a muffler or you can have a mandrel bent catbak with a str8 thru muffler with your choice of tips. or you can get a muffler on its own. think bout it. i know wat i would do ...... hang on ive already done it :D :D *points in directon of signiture*

so by going into a 3" sized piping you will lose a lot of back pressure n therefore lose a lot of potential power.

That's a common myth that people bring up when talking about large exhausts. Backpressure is just a measure of the restriction in an exhaust system, or a quote I stole from about.com,

"Restrictions in the exhaust system that slow the exit of exhaust gases from the combustion chamber."

It can be caused by small tubing, bends, badly flowing mufflers (as comes stock on most magna's) etc. Backpressure will be present in any system, but the less backpressure there is, the better. There is no "required amount of back pressure" to be had in any system.

Therefore you won't lose any power in a 3" system. In stupidly large exhausts, you can lose the effectiveness of the scavenging effect (the effect in which gasses are forced out of the system), and therefore lose a small amount of bottom end power. But it must be noted this loss is not created as a result of "low back pressure".

For more info, these guys know more than I do:

http://www.club240.com/forums/showthread.php?s=&threadid=1406

http://www.ford-trucks.com/forums/archive/index.php/t-80881-backpressure%20required.%20fact%20or%20myth%20%3F% 3F%3F%20(Falcon%20you%20there%3F%3F)

That's a common myth that people bring up when talking about large exhausts. Backpressure is just a measure of the restriction in an exhaust system, or a quote I stole from about.com,

"Restrictions in the exhaust system that slow the exit of exhaust gases from the combustion chamber."

It can be caused by small tubing, bends, badly flowing mufflers (as comes stock on most magna's) etc. Backpressure will be present in any system, but the less backpressure there is, the better. There is no "required amount of back pressure" to be had in any system.

Therefore you won't lose any power in a 3" system. In stupidly large exhausts, you can lose the effectiveness of the scavenging effect (the effect in which gasses are forced out of the system), and therefore lose a small amount of bottom end power. But it must be noted this loss is not created as a result of "low back pressure".

For more info, these guys know more than I do:

http://www.club240.com/forums/showthread.php?s=&threadid=1406

http://www.ford-trucks.com/forums/archive/index.php/t-80881-backpressure%20required.%20fact%20or%20myth%20%3F% 3F%3F%20(Falcon%20you%20there%3F%3F)

Nice.

Nice.

Back pressure is required for low rev torque. What is best is an exhaust that is restrictive (relatively speaking) to give low-down torque when revs are low, and then opens up as revs increase to allow high flow when it's needed (I think Farrari developed this system many years ago.)

Hey guys, first post from a Diamante Owner here, usually hanging out over at DiamanteOwners.com. I just got done doing a custom exhaust set up, 2.25 is the stock size for our exhausts over there so i upped that to 2.5 from the cat back to the gas tank then did a full T split into twin side exits. You can just about see the 9x1 inch tips i got either side on my car domain site here:

http://www.cardomain.com/ride/679479/11

Once i get a better camera i'll be taking better pictures.

Oh, and thats with a magnaflow 4 inch round 20 inch long glass pack muffler sitting right in the center of the car (just behind the cat) so its an even tone on both sides, with a nice deep tone with the 3.0 V6 that comes with the 1g Diamante.