Is the 4'' factory exhaust down pipe more restricting than the after markets? (silverline,mbrp...) I've seen the restriction in the factory air intake just past the air filter and heard the down pipe had something there also.

Oh yeah it is getting cold here in Michigan ! wheres the best place to purchase a cold front kit for the grill and the batteries?

 

The only thing restictive in your 04.5 exhuast is the cat and muffler, it is full 4in from turbo back.

 

Thanks for the reply any suggestion on a cool sounding muffler?

 

Yeah... a straight pipe...