no you do not but it will help spool up faster and maybe give you a couple HP. It probably costs the most for install because its a pain in the butt. also check out the o2 dumps for quicker spool and no taper. I have the oem exhaust mani and o2 housing and i make over 400 whp
alright bro, so if i just get a downpipe, test pipe, and a cb xhaust; i should be good as far as turbo back goes, and then when i get the money do the o2 housing, cuz yea you were right, the mechanic wants like 400 dollars for labor just for the o2
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