valves

Hey, I just switched out my stock exhaust for an MBRP cat back exhaust which doesn’t have valves. I wasn’t aware that my car literally just wouldn’t change drive modes anymore without the valves, so I’m stuck in normal mode and my throttle isn’t as sensitive as I want it to be. Is there any way...

Havent posted in a while so here goes. Went in to do valve guide seals cause I would get the blues after decelerating and stepping on it again or long time under manifold suction like going slow up my road. Read on here about another guy that had somewhat the same issue and his seals were...