PaulSS

What's everyone think of a cut-out?.. id love to have one just for the hell of it..

brianfcp

it would actually benefit the SS/SC, but not the 2.2L. The quicker you can get the hot air out of a forced inducted engine, the more performance youll get.

PaulSS

and they're pretty cheap.. prob gonna be my first mod

b-spot

Not true. You need back pressure. Cutouts work great for turbo's because there is a turbine between the exhaust manifold and the tail pipe.

Co27SSKid

sorry guys, i'm not ontop of my game... whats a "Cut-Out"???

codyss

A cut out is a valve that is placed in the exhaust system that can be opened to bypass the muffler.

olddude

Ouch....nothing personal, but this is one old-wives tale I wish would go away.

Net engine output will increase with less back pressure. Lowering pumping losses (back pressure is a pumping loss) allows the engine to waste less of its output at all RPM and put more into turning the crankshaft.

Now, there are exceptions, primarily on race cars with 180* headers. (of which you will never, ever fit in the engine bay of a passenger car.) It is possible to tune an exhaust to help with scavaging at certain RPM, but it is not a practical option for street cars.

You may notice more improvement higher in the powerband than down low (you get more benefit up high because that is where you see the highest back pressure), but a dyno will show increases everywhere.

I believe some people think they lost low end because the top end pulls harder and the noise from an open exhaust makes them think they are more into the throttle (down low) than before the cut-out was installed.