Question on stock Exhaust

[miamieclipse]

Damn i used 2.25" piping, i have straight pipes tho w/out the cat, i heard that if u used 2.5 u would lose all back pressure....damn it

 

[Fez1085]

i've got 2.5" from the cat back.. and i love it

 

[andymoraitis]

Originally posted by miamieclipse
Damn i used 2.25" piping, i have straight pipes tho w/out the cat, i heard that if u used 2.5 u would lose all back pressure....damn it

Unless you have a turbo car where backpressure is a no-no, removing the cat actually slows the car down on the low end where it needs the most help.

And, to finalize the exhaust issue, I had a 95 Cobra before I bought my Eclipse that made nearly 400HP with bolt ons and iron heads. We dyno tested it with 2.5" stock mandrel pipe and 3" and the car LOST power with the 3" so I can't ever believe that an N/T car that only makes 140 HP and maybe 160 with an intake and header is EVER going to need anything larger than 2.25". If you had a turbo then I'd go 3" all the way.

You made the right choice and don't let anyone tell you differently just because shelf bought units are 2.5"

 

[Damn 2nd Gear]

thanks for the info!

 

[andymoraitis]

Originally posted by Damn 2nd Gear
thanks for the info!

Glad I could help, now go enjoy that DSM!

 

[blkout1104]

im a newb so can any of you dsm pals post pics of your 1g gsx and 1g gs exhaust system stock or modded. i want to know how different each is from eachother. thankx this will help me decide once and for all choosing a system.

 

[IceDragon]

well i don't know about the turbo exhaust, but i know for us non turbo guys, our stock exhaust is 2 inches...

 

[ivanr4g63]

The stock exhaust on a turbo car is supposed to be 2 1/4"... but from what I've personally have seen its more like 2" inner diameter turbo back, and probably a tad smaller on the bends.

 

[nelapse]

I was under the lift the other day inspecting my exhaust system, well it got me thinking, our exhaust is not really all that restrictive. So my question is... wouldn't it be a waste of time to get like a catback? my down pipe is 2.25" and your exhaust system is really as good as your smallest pipe right? Also I want to get rid of my so called "performance" muffler, doesn't a gst muffler section bolt right up?
My down pipe isn't stock either just to get that out the way. I just dont see any restrictive bends.

 

[FreStylMotoX01]

yes a GS-T Muffler bolts right up. the reason for cat backs is so that we get a larger pipe diameter and smooth mandrel bends which helps out. not a ton but it is noticable when you have other mods on your car. if you don't want to spend a ton of money on a catback do what i did. go on ebay and buy a holley thundermuff cat back cost me $100 shipped (that's not a typo) but i see them for $140-150 shipped these days and then put a better quieter muffler on it. cheap and effective

 

[nelapse]

All the bends look mandrel bent to me on the stock, no ridges whatsoever. none. That surprised me. I am thinking about a gst muffler and call exhaust a day... anyone have an extra for sell?
Also i have plenty of mods... I just dont see the need of bigger exhaust if our downpipes are smaller you know? I have never seen a DP for our cars bigger than 2 2.5"

 

[FreStylMotoX01]

they are not mandrel bent they are press bent. i took mine off and looked at it.

 

[GSGoinFast]

I was under the lift the other day inspecting my exhaust system, well it got me thinking, our exhaust is not really all that restrictive. So my question is... wouldn't it be a waste of time to get like a catback? my down pipe is 2.25" and your exhaust system is really as good as your smallest pipe right? Also I want to get rid of my so called "performance" muffler, doesn't a gst muffler section bolt right up?
My down pipe isn't stock either just to get that out the way. I just dont see any restrictive bends.

if your not stock down pipe is 2.25 inches, then your smallest piping is your cat back, because it only has a 2" ID. the theory of its only as good as your smallest pipe isnt quite true. if that were the case, nobody would see any gains from putting cat-back exhausts on with a stock downpipe.

 

[nelapse]

A decent catback is like 600 bones... for some nickle and dime hp. It got me thinking. When I had my Z24 we used to go under the lift spray paint the whole exhaust black, drive it for a couple of days and put it on the lift again. where the paint stops flaking off you make a cut, then bolt the muffler there. The rest of the piping doesnt do anything because the air is along for the ride. I was thinking about doing that to my gs. I also did not know the ID is only 2inches...
I was interested in a highflow cat they are realtively cheap on ebay, but I did not want to lose too much torque due to backpressure.. what is your take on this?

 

[FreStylMotoX01]

you can get a decent catback for $200 but it all depends on what you want. but make sure you get something you like or you will spend just as much on doing it over again and again. i know cause i have been through like three exhaust setups. as for back pressure and losing torque check out this thread. it should be able to help.

http://www.dsmtuners.com/forums/showthread.php?t=168578

-Jon

 

[GSGoinFast]

A decent catback is like 600 bones... for some nickle and dime hp. It got me thinking. When I had my Z24 we used to go under the lift spray paint the whole exhaust black, drive it for a couple of days and put it on the lift again. where the paint stops flaking off you make a cut, then bolt the muffler there. The rest of the piping doesnt do anything because the air is along for the ride. I was thinking about doing that to my gs. I also did not know the ID is only 2inches...
I was interested in a highflow cat they are realtively cheap on ebay, but I did not want to lose too much torque due to backpressure.. what is your take on this?

my 2.5" tsudo N1 cat back cost me $190 + shipping brand new

 

[xXeclipstasyXx]

the stock exhaust on my 97 looked incredibly restrictive the way it came out of the muffler then curved up around the rear suspension, it actually looked like it almost backtracked a bit... as far as restrictiveness i dont know how much of a difference it actually makes

 

[triton185]

what is the diameter in inches of a stock exhaust pipe on a 1995 talon tsi.
thanks

 

[EuroEclipse]

i believe it's 2.25" since that is how big the stock exhaust is on my GSX.

 

[triton185]

thanks. I'm debating on a custom cat back system and what size pipe to go with.

 

[HighPsi92GST]

what are your plans on mods? 2.5 inch would be a good upgrade for mostly stock, or something like a 14b or 16g, bigger turbo then that a 3 inch would be needed pretty much.

 

[EuroEclipse]

if you plan on going with a bigger turbo in the future, i'd save yourself the trouble and go with the 3" first thing. you'll notice a huge gain with it, and you won't be buying the 2.5" just to have to turn around and get a 3" later on when you upgrade.

 

[jwahl425]

O.K., I did a search and it seemed like noone really knows wat the stock exhaust sizes are
1G Non-Turbo---?
1G Turbo FWD---2" I/D--2 1/4" O/D
1G Turbo AWD---2" I/D--2 1/4" O/D
2G Non-Turbo---?
2G Turbo FWD---?
2G turbo AWD---?
Please do not guess, I just want to know the facts, thanks guys.

 

[tstkl]

the downpipe on a 1g awd gets as small as 1.75 inches ID, the od is completely pointless to know

 

[jwahl425]

the downpipe on a 1g awd gets as small as 1.75 inches ID, the od is completely pointless to know

I just went out and measured my AWD downpipe, 2" I/D, I posted I/D and O/D so that there is no guessing or "I think". I want to build a 2.5" catback for my N/T laser and replace the flex-section while I'm at it, I want to know how much of a difference there will be in loudness, performance, and fitting and knowing the exact size of my exhaust will help me out, and I am curious as to what the I/D of the 2g's are as well. I found a 2.25" flex pipe and I wanted to know if it will fit my N/T, by the way, why do some awd exhausts get 1.75" small? just curious.