for some odd reason, the test pipes are either even or slightly less in the power making department. There are a few guys with full bolt ons, headers, intake, exhaust, hfc's making about 320-335whp, depending on the dyno, up from 275-285, that's pretty damn good I'd say! I think the average CAI, HFC, CBE combination nets about 30whp, not bad.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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