Hmmm, backfiring you say? How can I correct this issue?

doesn't HKS make a piggy back that you can use if your running on open atmosphere BOV. and your can adjust so they the MSM doesn't go crazy and throe any crazy signals to the ECU.

I don't believe any major piggyback will work with our ECU although the AEM will fix this problem and provide a lot of other solutions for mods. Check the Vendor section for more info.