How big should i make my exhaust piping?, 95 Celica ST Options

[WhipCreamCelica]

I have an invidia n1 exhaust muffler on stock piping, i was planning on going to a muffler shop and getting my catback piping in 2.5", and my down tube for my headers in 2", would these measurements be correct for my 95 st??? thank you, i need to know, i also have stock headers right now,

[hatchy_gt-s]

Wondering the same myself. Was planning on having exhaust redone from behind the second O2 senor and back. Remove cat, resonator, and stock muffler and stay with the stock 2" diameter and put a Magnaflow muffler on. Provided aren't going to do excessive modding to the engine I'd think 2" would be enough. I'm personally afraid of going too big, and having a bad sound. Hopefully someone that's been there and done that, can chime in.

I wouldnt remove your cat, its pointless your not putting out the power that requires a cat removal. A resonator doesn't restrict anything it just reduces exhaust noise.

My dd 95 corolla has the 7afe with intake and obx header and i did all the piping from the header to the muffler 2.5 and the car moves great and sound's fantastic.

It's the mod effect that you think the car is faster but it's not really. You cant feel or notice a hp gain from an exhaust because all you're doing is freeing up the path, you're not intaking more air, which means you're not pushing anymore out.

A car works like a vacuum, you have X amount coming in and X amount coming out, it doesn't matter how large the path is you can only push out as much as you're taking in.

This post has been edited by hatchy_gt-s: Apr 6, 2012 - 1:49 PM

[6gcpr]

Wondering the same myself. Was planning on having exhaust redone from behind the second O2 senor and back. Remove cat, resonator, and stock muffler and stay with the stock 2" diameter and put a Magnaflow muffler on. Provided aren't going to do excessive modding to the engine I'd think 2" would be enough. I'm personally afraid of going too big, and having a bad sound. Hopefully someone that's been there and done that, can chime in.

I wouldnt remove your cat, its pointless your not putting out the power that requires a cat removal. A resonator doesn't restrict anything it just reduces exhaust noise.

My dd 95 corolla has the 7afe with intake and obx header and i did all the piping from the header to the muffler 2.5 and the car moves great and sound's fantastic.

It's the mod effect that you think the car is faster but it's not really. You cant feel or notice a hp gain from an exhaust because all you're doing is freeing up the path, you're not intaking more air, which means you're not pushing anymore out.

A car works like a vacuum, you have X amount coming in and X amount coming out, it doesn't matter how large the path is you can only push out as much as you're taking in.

Well, i personally feel the car more light and nimble than before. I know i gain almost nothing of hp but i don't feel the car being held back as much which is what everyone has told would happen with this setup including my mechanic whom i've known for 12 years.

[hatchy_gt-s]

Wondering the same myself. Was planning on having exhaust redone from behind the second O2 senor and back. Remove cat, resonator, and stock muffler and stay with the stock 2" diameter and put a Magnaflow muffler on. Provided aren't going to do excessive modding to the engine I'd think 2" would be enough. I'm personally afraid of going too big, and having a bad sound. Hopefully someone that's been there and done that, can chime in.

I wouldnt remove your cat, its pointless your not putting out the power that requires a cat removal. A resonator doesn't restrict anything it just reduces exhaust noise.

My dd 95 corolla has the 7afe with intake and obx header and i did all the piping from the header to the muffler 2.5 and the car moves great and sound's fantastic.

It's the mod effect that you think the car is faster but it's not really. You cant feel or notice a hp gain from an exhaust because all you're doing is freeing up the path, you're not intaking more air, which means you're not pushing anymore out.

A car works like a vacuum, you have X amount coming in and X amount coming out, it doesn't matter how large the path is you can only push out as much as you're taking in.

Well, i personally feel the car more light and nimble than before. I know i gain almost nothing of hp but i don't feel the car being held back as much which is what everyone has told would happen with this setup including my mechanic whom i've known for 12 years.

Im sorry I should have been more clear I was talking the diff between a 2in(recommended) exhaust and a 2.5in. Yes, the car will have more response when changing from stock because you in crease the air flow.