67 GTO / Pypes 2.5" X-pipe system / RacePro

This 1967 425HP GTO sports a Pypes 2.5" header-back system with an X-pipe. The system includes a pair of Pypes RacePro mufflers because of it's superior flow ratings.

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'70 chevelle with 555 ci big block. 11:1 pump gas engine with a big solid roller, AFR 335's, vic jr., pro-systems HP1000 carb, 2" headers, 3" collectors, full 3" duals with x pipe running Pypes Race Pro mufflers. Electric cutouts are installed. Car has a TKO600 trans and 12 bolt rear end in this video. GForce GF5R and Ford 9" are going in this winter. Engine made 792hp/701tq at the flywheel on a superflow engine Dyno. Chassis Dyno showed 618rwhp AT 5500 ONLY - data did not log up to the 6800 it was run to due to a Dyno error. Based on the 70hp increase from 5500 to 6800 rpm on the engine Dyno (horsepower peaks at 6800rpm), we are guessing we have around 670-690hp at the wheels. Car will be back on the Dyno in the spring. Engine built by Mike Lewis of Lewis Racing Engines, Laytonville, CA.