Originally Posted by BonBG35

As I understand it, the stock spacer is too small and starves the cylinders of air. By adding space btwn the upper and lower plenum you allow more air which in turn adds more power (about 10whp). Also they help prevent heat soak in the upper and lower plenum but that's only with the copper and isothermal spacers. And if you plan on getting a strut bar or keeping your engine cover, the 5/16 is the one you want. 1/2 plenum spacer adds 1-2hp more than the 5/16 but you wont be able to use your engine cover. I haven't seen anyone getting a CEL and you get a meaner growl from the hood. It's a win/win. This mod applies to VQ35DE engines so G35,350z,m35,fx35

Theres more info on the MD website.
http://www.motordyneengineering.com/G35.php

Originally Posted by spinna001

Engine cover will fit with the 1/2 spacer. I currently have it

Originally Posted by SlickSilverG

I listened to the Fast Intentions, I dunno don't like it. Bit too muffled. Deep, but too muffled. Reminds me of a pontiac V6 'performance' exhaust.

Originally Posted by BonBG35

no modification needed?



yea its deep. Have you listened to the MD shockwave? although I think it might be a bit too loud and obnoxious. Nismo sounds good though. Perfect for those that want to keep the VQ sound but amplified.