The sticker in my door also only refers to 19" wheels.
I wondered if the TPMS would send a warning if it thought you'd overinflated the tires but a quick check of the owners manual says it wouldn't. It only sends a signal if your tire is low (3-6 psi below recommended) or if it detects a tire is flat. So adding extra air wouldn't bother it.
BTW...
Why don't you want to keep the 19s on? They look great on your car.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
Last edited by husker boxster; 01-22-2009 at 06:03 PM.
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