If your friend had little effects with Meth Injection then he didn't do it right...Meth is the poor man's intercooler and works awesome. I'm running 100% Methanol on mine. I vote VS cam and Meth. Why? Because those will allow you, if you have a capable tuner...to most likely run a sub 3.25" pulley if your injectors allow it. That also means you don't have to change valve springs or retainers...but that's up to you.