Upper Plenum showdown....

[jaxter1]

Remember, that's REAR WHEEL HP....on a dyno....so, it's not too bad considering it's just an intake flow improvement.......anything that nets a half-dozen HP reliably sure helps even stock. When combined w/exhaust, timing, etc it's a no-brainer, you'd need it anyway. I'd like to see that same test w/a stock exhaust, prob would make even less gain.....it's old news but most mod's wind up improving other mod's....where to stop is the trick....