no forced induction as of yet, thinking maffless tune, otr, pacies 4into1 non coated, 2.5inch stainless xforce dual system hiflow cats (metalic0 so they dont bust? or better to just gut ceramics? 3inch overkill? n some1 said that single 3" pipe is better than 2.5" dual.. bitta input tuners plz much appreciated
If you're looking at 'best possible power' as you say, you don't want X-Force. Look at a better quality cat-back. Also you want your cats to flow so 3-4" would be better than 2.5".
or u can get a custom 1 made up i have a custom exhaust on my R31 Sedan from the headers to the tip and with out that bling on the end of them its all stealth and its 2 quarter standard cat is in place aswell
i bought a xforce twin 2.5 full stainless catback for a 100 off a mate and it sounds good but if you just want max power go the full 1 7/8 extractor with full twin 3 cats and system