6G Celicas Forums

I'm about to have this done to my 94 ST! I ordered headers, a cherry bomb (glasspack style) resonator, and a high flow muffler canister style with a 4in tip (burnt) but I'm using a 2.5in piping mandrel bent from the headers back with no cat. I'm looking to have a nice deep throaty tone and be very loud!!! :D I will post pics of the before and after and maybe a video if it sounds decent on camera.

Okay so my question to you... if it were you, would you get a header and if so what brand? I've heard of DC but do they make headers for the 7A-FE. And can you add a cat. to a custom exhaust, I mean you can but how does it work?




What header did you get? And yes I'm doing 2.5 inch piping as well. You sound excited like me! This will be my first engine mod!

mehh 2.5 inch exhaust on an st I don't know about that you might be losing power???

^ Yeah, let us know if the performance changes at all. 2.5 on a normally aspirated engine might be too big.

What would happen if you put 2.5 on? Would it really lose power?

does it matter?
its a st

This post has been edited by sincerelyseb: May 18, 2011 - 3:42 PM

Are you trying to gain more power by re-working your exhaust system and getting a header, or are you just looking for more sound? I would be careful opening up the exhaust too much on an st or any n/a motor for that matter because you will lose lower end power and torque Getting an aftermarket header also will eliminate the factory catalytic convertor which could cause issues passing emissions tests and having local exhaust shops touch your car because it's technically illegal to remove the cat from it's factory location. I have a 94 st that I put a header on and greddy exhaust back in high school and didn't really see any noticeable gains. Car sounds good though

yes you will lose power down low the st only outputs a weak 115hp with a full exhaust and intake. Most Japanese Exhausts (for the ST202 with 177hp and ST202 SS-III with 197hp naturally aspirated engines) come in 60.5mm exhaust piping. Anything bigger than that and you would lose some torque and gain top end

I've read that some Integra Type R guys have used 2.5 inch catalytic back exhaust systems with good results, I have not seen any dyno videos of this so you'll have to do your own research.

This post has been edited by BonzaiCelica: Sep 12, 2013 - 11:24 PM

the problem is the 5sfe and 7afe only have ebay brands, i know there are some other branded ones long ago, but they seem to be lost in space now. its one of those, we gots no choice.



i would stick with a 2.25, that 7afe just don't put out enough, in fact a 2.5" on a 5sfe is a little too big, switches the power too far to the right instead of improving midrange. if you got like cams on a 5sfe or a decent built one it would be good though.



its alright on a type r cus they push out decent power without having to lose torque as much as a 7afe would down low, which the 7afe is already low torque.

This post has been edited by trdproven: May 18, 2011 - 10:10 PM

Merged with the other custom exhaust thread. why have 2?

Wow an old thread, just going back on a bit of history, at the time I thought 3S-GE were equipped with 2.5 inch they are actually 2 inch I don't know why I thought 2.5. Even my GT4 originally had 2" after the cat and thru the flexi, and then onto a 3" aftermarket system.

I have 3" from the back of my turbo to the tail pipe now with just 2 resonators and a canister in the rear, no cats or bull**** small pipes.

So i got JDM st202 with 3SGE (ss2)...original have 2 inch pipes....
....so i change to HKS manifold and HKS downpipe (wrap them both) plus Magnaflow high flow cat. magnaflow resonator and Magnaflow street version Mufler - all pipes are on 2,25 inch
Results:
minuses: the car i is to loud and my low and middle torque just dissapear
pluses: car goes better on high RPM!
so for me i spend so much money for little more power on high RPM but the middle torque miss me so much!!!
I don't recomend bigger pipes to car with less power than 200hp....

cheers

Dimitri

p.s.
thinking to change my backbox mufler with Apexi SW2 (wich is bigger than magnaflow one) and the resonator after the cat with 1140 Vibrant Performance Ultra Quiet Resonator so i can get back some of my backpresure....and low and middle torque.....

This post has been edited by cyprus_gt: May 19, 2011 - 1:22 PM

^ its true its the pros and cons of the exhaust setup. if you like torque don't upgrade if you like performance on the top end, then upgrade. You win races more with the powerband moved to the right, but it still needs to be balanced with some torque. Straightflow lets you stay longer in 3rd and 4th gear. I went back from 2.5 to 2.25 and now I have some midrange torque back.

you need a engine swap badly trd proven jus sayin

on the other hand I got this information from the beams owners group :

3" = 275 to 425 HP
2.5" = 225 to 275 HP
2.375" (60mm) = 200 to 225 HP
2.25" = 175 to 200 HP
2" = 125 to 175 HP

These are just 'general' guidelines, routing/bends/mufflers/etc will all change how the system will actually work out. So 2.25" using nice mandrels and good flowing mufflers/cats/etc would be perfect for a stock motor, 2.375"/60mm very good and not so big that you would see much in the way of losses and would be great for lightly modified engines. 2.5" is good if you have plans to modify a little more heavily and/or are going to use it as a track car.


Exhaust sizing doesn't make horsepower. It keeps you from LOOSING horsepower due to restriction. Your looking for a balance that keeps the exhaust gasses/air FLOWING at an ideal speed (around 240-260 FPS IIRC).
Too small restricts it by choking flow off at high RPM.
Too large slows it down by having too much room for the exhaust gasses to expand, which creates a slow moving 'wall' of exhaust.

This post has been edited by BonzaiCelica: Sep 12, 2013 - 11:25 PM

....so just order the Apexi SW2 muffler and Vibrant Performance Ultra Quiet Resonator ...the problem is that now all my pipes are in 2.25 inches and this 2 part are only available at 2.375 inches so i hope to be ok but is a very small difference i hope to eliminate the noise from the backbox and got back some torque at the middle range...will see

cheers

btw:
the car have ICON superchip box wich reprograming the ignition and K&N air filter plus aftermarket sparks and sparkplugs....so for this 17 years old car she goes soooo nice just need to make good balance with the exhaust modifications!
when i put the new parts will let you know - i hope i didnt spend my money for nothing

This post has been edited by cyprus_gt: May 20, 2011 - 8:56 AM

how would you think a 2" inlet and a 3" outlet with silencer work on a stock (I think) st exhaust. Mind you I'm not looking for power just looks but my main issue is the loudness, I don't want the car to be loud while driving at 70mph (3,000 rpm) as this would drive me nuts on the highway.

I'm looking at something like this
http://cgi.ebay.com/ebaymotors/New-2-Inlet...sQ5fAccessories

This post has been edited by NYp8tBaller07: May 21, 2011 - 2:00 PM

that is a good set up mind you like the oval styled canister. the tanabe would be a good choice too since ive heard them and they are pretty quiet. but yea, just get the ultra quiet resonator the oval style and the longest you can find to keep the noise down. If you are running catless or doublecatless if cali model, you can always double up on the resonator later. but your original set up is ideal and will be deep but running catless makes the change. but whatever sound you want you can get, it can be adjusted for sound, with resonators. its the deepness you can't adjust, thats the muffler.

you have no worries about the pipe sizes being different, you can even go from 2.25 and switch up to 2.5. so 2.3 is a smaller change from 2.25.

This post has been edited by trdproven: May 21, 2011 - 8:09 PM

not my video but thought I'd share how the Apexi N1 exhaust sounds, in which you can sometimes find used on nengun auctions...

http://www.youtube.com/watch?v=HJbGECW4XpQ

I'm putting up thees links of hks exhausts since Rusty is too much of a wuss to do an exhaust clip of him revving his engine or a flyby.

http://www.youtube.com/watch?v=cLazdOWcjqY HKS REVING

http://www.youtube.com/watch?v=k4wjE1NOFok Celica ST202 on dyno with full stainless Steel exhaust System.


This post has been edited by BonzaiCelica: Jun 2, 2011 - 11:12 PM

Gone with the Apexi N1, in with the new

So you had an universal 60mm apexi n1 muffler and you had a exhaust shop makd u a custom over the axle steel piping exhaust? Im talking to 808celica