Forge Type RS Atmospheric 34mm BOV for Evo 4-X 3000GT (FMDVRSA)

Forge Motorsport atmospheric blow off valve (BOV) fits all Evo 4/5/6/7/8/9, Evo X, 3000GT and Stealth or any setup using 34mm flanges. These valves are made from billet aluminum and the atmospheric design expels the air straight to atmosphere giving you that "whoosh" when you let off the throttle.

Vehicle Fitment:
2008-2015 Evolution X
1996-2006 Evolution IV-IX
1991-1999 3000GT VR-4
1991-1996 Stealth R/T
Universal fitment for 34mm Flanges

More Information:
The RS valve has a larger 50mm internal bore with a convenient top-adjustment for the spring preload. Available polished or black.

This is not a recirculating bov and will work best with a MAF-less speed density set up.

The Type RS uses a unique conical, progressive rate spring that can allow for the retention of boost pressure from 7 to 22 psi. If you are running over 22 psi then you will need the uprated spring, which is included in the kit. This unique spring design will also allow for unrestricted piston travel and flow volume regardless of the amount of pre-load adjustment added to the spring.

Purchase Includes:
(1) Valve
(1) RS Spring
(1) Yellow Spring
(1) 34mm Blanking Plug