I want to run Dual's all the back from the 3" pacesetter Y pipe.I do have the long tube headers to. Do you Guys think I will lack the back pressure that I need with the mods I have in my Sig .Any advice would be help full. Thanks

 

go 2.5" with cats and you will be fine without cats it will lose a noticeable amount down low.

 

Thanks

 

No one "needs" back pressure. Tune for it.
Ron

 

you don't need dual 3 inch. the only time you need that much is if your running FI or high HP like over 500 to the wheels. then a 2.5 will hender you. You will loose low end it's jsut a fact unless you have enough power to make up for it or a supercharger to help you down low.

 

Just go with a single 3" IMO. I was running true 2.5" on my truck til 2 weekends ago. Went back to a single 3" and am much happier.