No power gain from Underdrive Pulley?...

[heliguy]

Originally Posted by heliguy

Has anyone seen this on Suncoast?

Boxster Performance Exhaust
Agency Power has developed and tested this exhaust system for the Porsche 986 Boxster. The all T304 stainless steel exhaust features a mirror polished finished, thick flanges, OEM fit, and an incredible sound. Producing an amazing sound which gives the Porsche a nice race tone, this exhaust is still comfortable for daily driving. As tested on a Mustang Dyno, the Agency Power Porsche 986 boxster exhaust produced an impressive 23HP and 11ft/lbs of torque.
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#AP-986-170
$695.00


I'm not sure I believe their claimed HP increase.