Won't cause problems, just the potential gain might not be so great, depends on the factory EP3 Headers how much they can restrict... And the CAT too... Best to check what CAT has been installed, if its a cheap compliance CAT, it could choke your car like they did with my AE111. Change it to the JDM CAT and all was good in the world lolQuote:
Originally Posted by CivicTypeR
