I'm ordering the EVO's next week. I heard the Y-pipe's too short. Alright, i'm making that adjustment. My question is for all CL/TL owners with full cats. Does your engine light come on? The guy at boomplustoys told me that it would with any full catback because the O2 sensor would pick it up since it's a high-free flow exhaust. I need help from everyone including the moderators. Thank you.

 

Nope...no logical reason for it to come on with a cat-back system.

 

My check engine light never came on with my Tanabe Hyper Medallion.