I've got something strange happening since I installed my SISO Maggie on my 07. Now cruisng down the highway 65 - 70 mph, when I go over some harsh bumps or expansion joints the truck downshifts to 3rd. I first thought, I'm hitting the gas pedal when I hit the bumps, but this happens when cruise is on. Never happened before the exhaust when on, or if it did, I never noticed.

Any one have any ideas of what the heck is going on? I did disconnect the battery when I installed the cat back system. Might try that again to see if clearing things helps.

It's always something with these things, isn't it....