6G Celicas Forums

^ Ya for a street car you dont need any of that. A larger pipe with a hi flow muffler is all you need. If you want 2 build a race car then yes you should do the research.

Or if s/he has a solid plan to go turbo within the life span of the exhaust.. ex: i have a 95 ST and am in the process of making a 2.5" exhaust for it.. there are a few strategies that i am employing in my design.. but this exhaust will last me till after i go turbo, and just before i implement my last phase of my plan for this car..

i guess what im saying is that the questions you are asking are good ones but the main one you need to ask your self is what do i REALLY want to do with this car. that will dictate what is or is not good for your application.

I would just go 2.25" piping and follow the OEM paths, simple. IDK about 2" because I think the stock is 1.75" so its not much of a difference to burden yourself for a .25 "upgrade". Plus the greddy sp2 makes the exhaust that is also for the ST, and thats about 2.36~ so in the middle 2.25 is good already.

2.5" is just ridiculous for an ST, don't even think about this.

This post has been edited by trdproven: Apr 9, 2012 - 6:03 PM

Well today I went to go do my exhaust, I replaced all the axleback piping with 2 1/4" piping, I went under the axle cause theres enough clearance, looks great, souds way better, ill try uploading a link to the vid here soon

2.5 is larger than stock for half of chevy 350s, and they are 5.7L
Too big will ruin performance and probably throttle response


This post has been edited by Special_Edy: Apr 9, 2012 - 6:16 PM

I agree with you on the 2.5, which is good for turbo already. but i did at one point run a 2.5" 5zigen catback and it wasn't that bad really. I thought it would be bad. But the 2.5 works ok on 3rd gear especially and then up. But i prefer the Greddy SP2 of course. Still so, wouldnt go back to 2.5 though, wouldn't recommend it, but the 2.25 is okay for him nothing bigger.



Powerband feels different when you drive? Headers, downpipe, piping size, intake air filters, resonator, and muffler combination will give you your final sound.

This post has been edited by trdproven: Apr 10, 2012 - 2:08 AM

A number of things play into exhuast design, not simply a diameter. Design efficiency as a complete system is very important, material selection, beyond this there are mechanical and ancilary attributes that contribute to the values that equate the ultimate formula. Again, what is desirible for race car is not pragmatic for road car. The area in which engine speeds
are operated at play a fact.

You have a 1995 ST, so I'll assume you have a 7AFE and not swapped anything. I can tell you that very few firms have dynos deticated behind systems
for the 7AFE. How response and power is created is very important. Remember the factory management is fairly crude, and is not capable of making major adjustments.

I would need more information about what you are trying to achieve to give you a professional opinion. A number of factors and a dollar to power ratio.
Is this merely a replacement, or is this for something special or you have specific areas of interest that need fine tailoring?

Regards,
Mick

revival ha. ok so anyone have experience with IS300 or SS-III 3sge Beams OEM Exhaust muffler. are they true 57mm going into the muffler. I know on GT Celica's the muffler tappers down from 2 inches to 1.5 inches going into the muffler. is this the same for IS and Beams?

IS300 is a 2JZ-GE

yes i know i read is300 and rs200 (5th gen beams that came in japan RS200) use 57mm piping. im trying to find the thread now on beams owners group mr2 board section but can't.

one guy said this on beams forum from mr2 board I'm using a standard Altezza rear muffler, and a fibreglass packed one about half way down the car.
Altezza muffler is quite a cool design, it's got a spring loaded flap so that when enough gas flows through to open it, it bypasses a few of the chambers.
So nice and quiet(ish) while cruising and the flap is shut, then when you've got your foot up it, it minimises restrictionrs
is this true? even for the is300 muffler.... aah found source but pics are dead. http://my.is/forums/f87/ever-wonder-why-st...rictive-113759/

sound of stock rs200 exhaust
http://www.youtube.com/watch?v=w8uhYdaurTE

This post has been edited by BonzaiCelica: Oct 28, 2013 - 12:15 AM

You might want to give this a read:

http://www.motoiq.com/MagazineArticles/ID/...ust-System.aspx

i went 2.5" on my 5sfe and it sounds great up till i hit 4k rpms, then it turns into a raspy rice cake.
granted i have no resonator but its still annoying as hell at high rpms