has anyone actually tuned this ok by themselves? i want one but no one close know how to freakin tune it so i would have to do it myself. honestly i wnt to tune it for premium but i dont knw if that will help power or not. any input? im up in the air but pretty ready to get one. also i put some enkei j10s on my car and really i think my car is slower i thought they were lighter so is it the car or just me?