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Blue02GT · 02-04-2005, 06:17 PM

They do work, but it's a small gain. I know a guy with a GT that ran low 12's high 11's without a power adder that used one and swore it dynoed at a 8 hp increase. If you buy an after market plenum they have tha raise built in to them. It basically lengthens the runners which will add a little grunt down low.
You can get a spacer and port the factory plenum with a Dremmel tool. I ported mine and did pick up 1 miles per hour at the track.

02-04-2005, 06:17 PM	#9 (permalink)
Blue02GT Ex Mini Smack King Join Date: Nov 2004 Location: St. Louis Posts: 868	They do work, but it's a small gain. I know a guy with a GT that ran low 12's high 11's without a power adder that used one and swore it dynoed at a 8 hp increase. If you buy an after market plenum they have tha raise built in to them. It basically lengthens the runners which will add a little grunt down low. You can get a spacer and port the factory plenum with a Dremmel tool. I ported mine and did pick up 1 miles per hour at the track. __________________ True Blue 2002 GT Premium 4r70W 1/8 8.205@ 84.780 1/4 12.874@ 107.20 Bolt on's n/a NMRA #7703 Dyno'd at Modular Depot 251 hp. 291 Tq. 4.30's, 3500 Stall converter, Steeda upper & Lowers, Tokico drag struts, M & M frame connectors, P & A valve body, C&L plenum, Accufab 75mm TB, Jet Hot Long tubes, Hooker O/R X, Steeda catback,SCT tune,Steeda pullies.