jschmitt: The only intake system currently available for the 05 / 06 SSR is the one from K&N. They also make a DIFFERENT part number kit for the 03 / 04 SSR, so be sure to get the CORRECT one. They are NOT interchangeable.
hdflstf is correct about cimrotuners not yet being available for the 05 / 06 SSRs, becaue of the change to CAN archittecture for the electronics.
Even the rear axle change is a hassle for 05/06 owners until the 05/06 microtuners become available, as there is no current easy way to change the axle ratio in the computer to match the new ratio, unless you have access to the one of the few tuners in the country who has penetrated the 05 / 06 computer on his own.
If you really want to re-tune the computer on an 05 / 06 right now, the best and easiest option is to contact Lyndon Wester (do a search on the board for his contact info). He can re-rpogram your SSR "remotely".
The biggest bang for perofmrance dollar spent is the rear axle change. Go from 3.73 to 4.56 (Yes, I know it sounds radical, but for reasons explained in my book it is NOT radical on the SSR).
For more info, you can get a copy of my 320 page e-book "The SSR Experience", which covers everything you want to know about the SSR, any model year, by going to:
http://www.ssrfanatic.com/forum/showthread.php?p=69594#post69594
on this board. The book covers all popular modifications and why / why not to do them.
Jim G
[email protected]