I own a 2.2L and i have a injen cai, and a GMPP performance Exhaust. I want to buy a new downpipe with a highflow cat. I was thinking maybe getting the 3" downpipe from ZZP. What size does anyone think i should get?

 

I think maximum 2.5 all the way back.

 

well the GMPP Exhaust is 2.25 that i hate. Im thinking about selling it and buying the ARK Exhaust it says its for the 2.0L and 2.4L , but whats the the difference with the 2.2L?

 

The ark exhaust would definitely fit, but I think the 3 inch would be too big for a 2.2L with your mods. Get a 2.5 all the way back, actually the gmpp wouldn't be bad, but if you want get 2.5 all the way back.

 

u could just buy a muffler then go to an exhaust shop and have them bend 2.5 up for you, you'll only save about 400 dollars tho haha

 

Yeah you dont need 3" by any means... Even 2.0's running 250whp dont have 3" exhausts. Go with no bigger then 2.25 - 2.5. Even 2.5 inch is pushing it.

 

Thanks guys. i might just keep the GMPP Exhaust i wish it sounded a lil more like the ARK or DC SPort exhaust but o well.

 

u could take the resonator out for a deeper/louder sound.....and 2.5 is fine....its not "pushing it" because the majority of catbacks for EVERY car are 2.5 even those gay civics so ur cool with 2.5

 

why does everyone on here say that 3" would be too big??? I have heard all this stuff before about there being a problem with not having back pressure. My '07 colorado 2.9L I4comes stock with a 2.5" exhaust and it only has 185 hp. A guy I talked to was putting full 3" exhaust systems on his 5 cylinder Colorado and for a bunch of other guys including some with the I4 and were seeing good gains in the sound and power.

I would just like to hear a good explanation to why you wouldn't make better/more power with a full 3" header-back system on a small 250hp I4.

And I have heard some say that if you are turbo/supercharged that you should go with a 3", please tell me if there is a difference in the exhaust flow from a 250hp NA engine and a 250hp SC engine. Maybe there is a difference in heat or something, but volume of exhaust - no way.

engines are air-pimps, if they have the same amount of HP they move the same ammount of air.

 

Your top end is all but gone dude. With an FI car air is being forced in at greater rates than an NA car. there is an SS/SC near me, on this board as well. Has stage 2, a 2.7 and a full 3in-back...HE SAYS HIS TOP END IS ABSOLUTELY GONE.

Still, you're talking about a 250hp car...versus a 130-140whp car. Big difference.

 

ok thats one of the things I have heard, but what I want to know is WHY your top-end is gone???? I have thought about it, but it doesn't make sense to me.

and you're right, I see the original poster doesn't have many engine/performance mods. so we are sort of talking about two different cars, but you knew what I was talking about.

 

If you want a good explanation, I suggest you post in the 2.0 section, so that someone can give you the answer you want. The number of 2.2s making 250 HP NA is zero, and Supered or turboed is still very few.