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bikerboy_140 · 08-27-2008, 06:14 PM

so im kinda new to the subaru since i just bought one 2 weeks ago. if i hollow out the cats will it make it run worse? will i have to retune the ecu?

08-27-2008, 06:14 PM	#1 (permalink)
bikerboy_140 Registered User Join Date: Aug 2008 Posts: 18	wrx cat so im kinda new to the subaru since i just bought one 2 weeks ago. if i hollow out the cats will it make it run worse? will i have to retune the ecu?