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The first X-pipe is just a normal IPE x-pipe with 2 cats welded on. I have no issues with torque on my IPE. The car pulls in every gear and I havent gotten a stage 2 tune yet but will. I would just keep the F-1 if I was you.
Last edited by Ashley Schaeffer BMW; 09-20-2013 at 04:49 PM..
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