I have a B18C1 and am looking at purchasing ITR/CTR cams along with cam gears, VAFC and ossibly upgraded valve train.
My question is do I need to have an exhaust, header and hi-flow cat prior to doing this. I mean how much do those commmon bolt-ons assist with the camshafts and proper tuning???
I already have a CAI as well.
WEhen I do go exhaust I am looking at a JDM 4-1 header from an ITR with 2.5 " collector along with carsound cat and custom exhaust at 2.5"; basically 2.5" from header to tip.
Any help would be appreciated.