My friend had a Stage 2+ C32 from Evosport. It had the the SL55 intake, pullies, headers, ECU, and a few more things. Last thing he added was a sprint booster and he said it was one of the best mods he added.

There was a huge difference in power delivery and throttle response.

The comment about stock SRT6s with the sprint booster work fine but modded ones don't, is there any reason why?