i got a 95'gsr, the usual stage 1 setup-cai/jdm 4-1h/2.25 piping and exhaust with the whole msd setup, intake manifold, and cusco cat, no resonator. i know that to some certain point backpressure can be good and bad. but i just don't get why after switch gears, it seems to "pop." what could be the problem???? is it my piping? because of the mods??? or am i either running lean or rich??? or my spark plugs(oem), etc... please help me out... starting to annoy me...thanks guys