Originally Posted by
coz
could be a good thing. i've learned this from experimenting with my pipe. the more open i run it, i'll get a little popping on de-cel. i choked it down a little and it's great. zero popping or backfire. most of these aftermarket pipes are a little too freeflowing, hence the popping. maybe switch back to the stock air filter also to see what happens. it can only help the situation. ANYTHING but the s.tock pipe.i use a stock air filter, my homemade pipe and it runs smooth and strong always. no pops, no cracks, no backfire