I know many people on here have the sprint booster because they feel like throttle response is not as good as it should be with these cars. I wanted to let everyone know that since I got my ECU tuned the throttle response is ALOT better in all ways. It was good before but now it's instant! I just thought I would share that as maybe it is the stock tune of the ECU that causes the sluggish response on the stock SRT and other crossfire models.