wellI put a cutout after my cat and before my muffler thatI got from summit racing and i really think i loss some power with it off so im thinking its just back pressure but it sounds mean! lol this is what i bought http://store.summitracing.com/partde...p;autoview=sku

 

[sm=ttiwwp.gif]and sound clip

 

Its not a fancy one you can close off when you want to? Because you deffenitially just lost some power and mpg with that.

 

yea it has a plate you can put on but for sure it blows lol the power is almost all gone now so i just put the cap on and boomits like i never did it and i get all my power back. the only thing i like about it is the sound but even that is loud.