Hi Everybody kinda need some help I just swapped My D16Z6 out for a B18C1 That I picked up cheap thru a friend, Got the swap in and running in two days great right? Well all except I had to weld a 2.5" flang to my stock civic cat so I could run the header I got with 2.5" collector but it sounds like SH*T because I cleaned out the cat somewhat and in higher reving situations its ratteling bad What type of hi flo cat should I use (wanna use one not test pipe) that would match up nice? thanks

 

magnaflow sells a good one

 

i need some help im swapin a b18c1 into my 94 civic dx need to know do i use my harness from my civic and just wire the v-tec to the battry ground and ecu please help need it done by monday.