Originally Posted by Bloodhound
Nearest I have read is that the engine is broken in before it leaves the factory to seat everything in.
Depending upon what you wanna do, budget allowing, and that kind of stuff I would say mod away...just be prepared for a let-down if you are expecting to make serious gains without paying (dearly) for them. Best bang per buck I've read about is just to add a supercharger...but then you need to run premium all the time.
IMO its funny how people talk about putting on an SC and the downside is you need to run premium fuel all the time, Jeez its only 20c per gallon, if you can afford the SC and the fueling mods the extra pennies for fuel is trivial, lol..
But to the OP the ONLY real gain on power is the SC or just let it be...