i have an invidia v3 dual... at .8 or .9 rpm my exhaust would make popping noises... all i have is a testpipe cel fix, and drop in k&n... it is not tuned cause i'm debating if i should get a header and afc2 tuned... i am no baller anywayz can it be cause my car could be running too rich??? couple days ago my car just started misfiring on cylinder 1... got it fix by re-torque the spark plug... just wondering why would the exhaust pop like that... any advise can help....thank u...