Thanks Mike, what about mufflers instead of cats? Will that restore the stock power/torque? If so, any brand that would provide extra flow for more power while maintaining backpressure for low end torque? I know that's a bit controversial but maybe some brand came out with the optimal formula on ...

Hi,

I have a 2006 grand cherokee srt8 and i hollowed out the cats keeping them installed and have a huge loss of power and msifire, in addition to the check engine light since i did that. How does the email tune work? I don't wish having anyone install any custom tune locally, I'd rather have a ...