2" or 2 1/4" exhaust?

dschrier · Mar 8th, 2003, 05:58 PM

I know 2.5" is too big, but is 2 1/4" too big? I thought the general consensus was that 2" was the best size for a 4 cylinder engine. What are your opinions on this?

Mar 8th, 2003, 07:24 PM

Check out Mike Kojima's info at

http://www.sentra.net/tech/garage/engine.php?

He's got lots of good info. From a quick glance, unless you have a turbo, no bigger than 2" is the best.

AVERAGE · Mar 9th, 2003, 03:31 AM

i have 2.25 on my car. it doesnt seem like it has lost any power but definetly has gained a couple......

RiceBox · Mar 9th, 2003, 08:09 AM

2.0" for sure. Our engines don't breath as much as the GA16DEs do so 2.0" should be sufficiant.

SuperSentra4203 · Mar 9th, 2003, 06:24 PM

I had read somewhere that 2 1/4" is the best for the GA16i, but only if you pretty much have an open intake. I had the 2 1/4", but I also had a friend advance my timing. If you advance the timing, have a pretty much opwn intake, I'd go with the 2 1/4". If you just want a larger exhaust and leave it like that, go for the 2". 2 1/4" you'll loose some bottom end torque. I didn't mind that as I never shifted below 4500rpm.

myoung · Mar 9th, 2003, 06:26 PM

Quote:

Originally posted by SuperSentra4203
I had read somewhere that 2 1/4" is the best for the GA16i, but only if you pretty much have an open intake. I had the 2 1/4", but I also had a friend advance my timing. If you advance the timing, have a pretty much opwn intake, I'd go with the 2 1/4". If you just want a larger exhaust and leave it like that, go for the 2". 2 1/4" you'll loose some bottom end torque. I didn't mind that as I never shifted below 4500rpm.

2" is best for the Ga16de....I would imagine the same would hold true for the i

SuperSentra4203 · Mar 10th, 2003, 07:33 AM

Cool, I thought I read it somewhere. I thought 2 1/4" seemed too big.