I picked up a set of phenolic spacers from SRT SIX to run on my NA and let me tell you, they made a huge difference even on my NA car, intake manifold is noticeably cooler to the touch and my fuel mileage went up a good bit as well.

Plus rudy is an awesome guy and will treat you right no matter what you buy...
Bottom line
buy his stuff.

I wish you were closer or I'd try to get that stock exhaust and stuff from you.. Shipping something that big and awkward is just pure rape