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Are the gains from HFCs cost effective? I think going from a double to single cat improves the exhaust flow, but as pricey as those solo HFCs are, it's probably not cost effective for you to buy those.
Most of the guys in the LLT group are gaining power because of the headers IMHO. The bigger header pipes are more helpful in gaining HP than switching to HFC.
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Formerly owner of:
2012 2SS/RS Build Thread - Totaled by red light runner
2010 LT/RS Build Thread - Traded in for 2012 2SS
2007 Acura TSX
1992 Oldsmobile Achieva V6
1992 Mercury Sable
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