I noticed a lot of popping from my new Stage 1 Swept Exhaust on deceleration and even during shifting. I took it back to the shop & they replaced the fuel pump and several seal/gaskets around the injetor body. Still have the popping. The shop tells me that I may not have any luck with the fuel management systems on my '08 Vegas. Something about the '08s and after can't tweak the mapping? Isn't that what the fuel management systems are suposed to do? Can anyone help?