no really, stock ran alot smoother than it did with the flowmasters AT FIRST, they seemed to break in after a while and not be so bad but that may just be because I forgot what it was like stock. this new exaust I got on here that opened it up all the way made it seem like a whole new car and does not feel like it is choking at all,as to where the dual chamber made it feel like it was from about 4k RPM up.