Originally Posted by
Duster_360
I run several of these heads. I use one on my 2.5Tmaxx, one on a 4.6SS Sav and one on a GXR28 Kyosho engine. They work and are worth every penny. Its hot here and I'm not doing this so I can run leaner and get away with it. I tune normally then install a Nova cooling head to drop temps so engines run cooler and last longer. The heads are good for 30-40F temp drop, plus they look great! The fit and finish of their products has always been top notch.
I'm sur ethe one for the RS4 will be no diff.
Awesome thats good to hear, I'll go ahead and get one because same as here its hot!

So when it says it allows you to run leaner, pretty much you can lean your motor out more since its not running a higher temperature? Kinda confused.