Today's new cars are so advanced with their engines that tuning isn't what it used to be unless its a boosted car that you are tuning. Most of the tunes are their to adjust the timing and help get better throttle response along with personal adjustment options. The tune works well with other bolt-ons to benefit it but just a tune alone will produce minimum gains but you will notice that your car runs better. On the other hand, the new V6 mustangs look as if they get descent results. My 2012 V6 mustang bone stock running 93 octane put down 259. With 93 race tune, and cold air intake, I took it back and ran same gas and it put down 290. Don't get me wrong here, I would much rather have a GT than my six banger and no matter how many bolt-ons I put on, it will never hang with one.