Muffler or not
#1
Muffler or not
ok so here is what i have done I have an 03 fx4 5.4 with the edge evo programer k&n 57 series cai 3" mandrel bent out in front of the tire with a 5' tip I was wondering if I would see an improvement in power if I were to put some type of muffler on or leave it straight through