On 2006-01-08 06:41:00, Anonymous wrote:
"Ill let you in on a little secret in making your 4 banger have more power. Do not go out and buy one of those stupid big shiny noisy exhausts. Everytime when someone puts one on you loose 15 % HP easily. $ bangers need back pressure to run right, when you take a 1 inch exhaust then jump to a 4, you loose back pressure. Also there is soon to be a law passed to make all those loud exhausts illegal nationwide. Yeah!"
Well, I have two four banger cars, and you are dead wrong. The backpressure myth is exactly that, a myth.
I have a naturally aspirated 2.2L with a 2.5 inch full straight pipe exhaust with a header and a test pipe in place of the catalytic converter, as well as a hi-flow Monza/Pacesetter muffler. Don't tell me a 4-cyl. needs backpressure, the gains from freeing up my exhaust on the NA car were in the area of 15+hp
As for the 2.0L turbo in the All-Trac, boosting @ 15psi, everything after the turbo manifold is 3 inch piping out to the HKS exhaust
There is also no law on the books or about to be on the books regarding the current exhaust noise level of 80dB, and cars, all cars, I4, I6, V6, V8, V10, W12 like to breathe better, and a larger, better flowing exhaust does just that...
[ This Message was edited by: Mister Pink on 2006-01-09 11:20 ]