QUOTE(Me Too @ Apr 1 2009, 10:28 PM)

Adding a cutout won't hurt a thing. If it were me, to make the cutout really effective, add it before the CAT, but that is very hard to do, becuz of the way the crossovers join the main CAT. The only possible harm would be in backpressure that has become so low that the engine will no longer receive an adequate amt of exhaust gas recirculation to stop NOX and maybe some pinging. A way around this is to add 1.6 roller rockers. This ratio not only increases the valve lift, but raises hp AND increases valve overlap which makes EGR kinda redundant. It's a win/win situation in my book. A way around the exhaust cutout is to use a very free flowing CAT back exhaust system such as a Borla. Tests have shown that in the "wide open" mode (using the largest spacer), the system flows more than an open pipe, and that makes a cutout unnecessary. The noise isn't bad, in fact, it is very livable.
how much would those rockers run man?