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brillo · 07-08-2015, 11:12 AM

I wanted to revisit this concept as I thought I read somewhere that someone replaced the stock cat with a high flow version and was able generate most of the gains of a aftermarket header (i.e. get rid of the torque dip).

I believe the stock header design isn't bad but the cat is a major restriction. Can someone help me find information on this?

07-08-2015, 11:12 AM	#5
brillo Senior Member Join Date: Nov 2011 Drives: 2013 Firestorm FR-S Location: Houston Posts: 506 Thanks: 18 Thanked 77 Times in 64 Posts Mentioned: 10 Post(s)	I wanted to revisit this concept as I thought I read somewhere that someone replaced the stock cat with a high flow version and was able generate most of the gains of a aftermarket header (i.e. get rid of the torque dip). I believe the stock header design isn't bad but the cat is a major restriction. Can someone help me find information on this? __________________ 2013 Firestorm FR-S, MTX, build date 1/13.