1999 Pontiac Trans Am SLP Performance Parts Test - Trans Slam
400HP Pac Dyno Results
The 400HP Pac was worth 22 rwhp at 5,353 rpm (peak). From 5,500 to 5,700 rpm (not peak), SLP's headers proved to be worth roughly 30 rwhp. The LS6 manifold and SLP headers put out nearly 40 more rwhp, making those bolt-ons well worth the effort and expense. We tried the SLP DiabloSport power tuner (from the 375Pac) but didn't see a change in power above 3,500 rpms. (We did observe a couple horsepower below 3,500 rpm). View Related Article
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