Yea , im thinking of trying catless primarys with stock secondarys and see how that goes, but the sounds im experiencing seems like something is actually wrong, idk if its a vibration of something or what but i can be cruising at 70 mph and then all the sudden the sound will start and then go away 3 seconds later and come back randomlyYes any muffler combination I've tried with catless secondaries sounds like crap at specific RPMs.