hey guys i recently just purchased all this... stillen headers, high flow cats, and the jba evol system... i have changed my setup two times already and do not have the stock piping anymore... i believe it was changed a 1/4" bigger to 2.5? anyways i think its bigger cause the new piping fits over the piping coming from my stock cats. Should I have them change all the piping back to 2.25 (if thats wrong please let me know)? or should i leave the 2.5 thats on there right now?
also i am a little confused about b-pipes what exactly are they? is it just a pip to connect up where the stocks cats used to be?
anything else i should know before installing this setup?
thanks in advance for all your help!