Careful, guys.
From the 2006 press release from GM CANADA for the SSR:
"
A new intake manifold and revised calibrations helps raise horsepower to 400 (298 kw) at 6000 rpm for models equipped with the available six-speed manual.
"
(The press release copy is courtesy of Dan O'Toole. Thanks, Dan!)
As for K&N "guaranteeing" a 10% power increase, better get that in WRITING from whomever said it or put it on a website. The dyno cruve that K&N itself sent me recently for the Aircharger claims only a peak 5.5 hp gain at the rear wheels. Since an 05 SSR with auto makes maybe 325 rwhp and the 6-speed makes maybe 340 rwhp, the gain is more like 1.7%
Remember what I have been saying for a long time now: there is a very small gap between drug dealers and those who cater to horsepower addicts. Both tell you what you want to hear and believe.
Jim G