The frrp tune is really good and as mentioned prior, does not affect warranty. Not as aggressive as others, but here is the warranty. Very good throttle response and can definitely feel the performance difference in the low to mid range.
I have a 13 gt and have installed the mgw. Fantastic shifter, no missed shifts. The stock shifter has a rubber bushing support that is like a sponge...worthless for spirited driving....mgw is the best.