I've had this tune for 300 miles now and I love it! I put a sports muffler and exhaust tip on my 15 Malibu and it sounds great. I would say thus tune should be the first modification done. It has more hitch in her giddy up! Next thing I'm getting is the k&n typhoons cold air intake. It's amazing how sweet this tune is. It unleashes this power and drive trains full potential.