This is driving me nuts! I have 2.5" super turbo cat back, and a gutted cat. It ran and idled fine with the cat the way it is, but I welded on some 22" x3.5" tips and I've got slight pop at idle. It happens about every 2 seconds. I assume this is from combustion happening in the exhaust? It makes no sense for the tips to be doing this does it? Should I reset the computer in hopes that it was just running too rich at idle?