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TjXiong
01-21-2008, 02:16 PM
I am looking to buy an Apexi n1 on my eclipse gs. No boost at the time now. Running N/A. Would a 2.5 pipe, 4.5 tip work? Is there any difference between the sound of a 3.0 pipe and 2.5 pipe exhaust?
Kracka
01-21-2008, 02:19 PM
A 3" pipe will be a lot louder and more annoying on a N/A DSM. Hell, even a 2.5" is too big.
asshanson
01-21-2008, 02:22 PM
Do you plan on running a turbo in the future? If not then 3" is way too much overkill.

I thought the N1 was a turbo exhaust. Isn't it possible to lose power on N/A if it's too big?
xveganxcowboyx
01-21-2008, 03:15 PM
A nice 2.25 inch mandrel bend exhaust would probably be best for that car.
Kevin 1G Drummer
01-21-2008, 05:57 PM
Isn't it possible to lose power on N/A if it's too big?
Yeah, you can. Backpressure is more important on N/A cars, and if you put an exhaust on it that's too free flowing, you'll lose ome backpressure and some hp along with it.
TkrPerformance
01-21-2008, 08:38 PM
2 .25 on a n/a 4 banger is more than enuff
FattyBoomBatty
01-21-2008, 10:02 PM
Yeah, you can. Backpressure is more important on N/A cars, and if you put an exhaust on it that's too free flowing, you'll lose ome backpressure and some hp along with it.

BAH! Humbug. If you lose power, it will be in the lower rpms, maybe midrange, but you should gain power up top.

2.5 is plenty big.
Kevin 1G Drummer
01-21-2008, 10:35 PM
^^ Are you sure about that? I don't know if it's the same, but I had a little 50cc pocketbike. When I took the exhaust off, I gained a little low in the rpms, but lost alot up top. Put the exhaust back on, and got my top end back.
Swifty1638
01-22-2008, 02:05 AM
smaller diameter exhausts will yield more torque down low on N /A cars, but kill it and power up top.

-A. Swift
FattyBoomBatty
01-22-2008, 10:56 AM
^^ Are you sure about that? I don't know if it's the same, but I had a little 50cc pocketbike. When I took the exhaust off, I gained a little low in the rpms, but lost alot up top. Put the exhaust back on, and got my top end back.

If that was a 2 cycle engine (which I bet it was), they actually do benefit from backpressure, I believe. I know what you are talking about though, my friend's 80cc scooter exhaust broke off at the flange once and we re-welded it and it was faster. Took it off and saw some bumps of metal from welding on the inside of the pipe. The turbulence those bumps caused probably added backpressure and thus, a little more power.