[BruceJ]

I heard about this, the increasing HP feature was only optioned with automatic transmission and paddleshifters. It allows you to more easily learn how to deal with higher HP cars. I think BMW considered calling it the i-HP (intelligent Horsepower) Most folks went for the M, but the really saavy shopper bought this. Proves how the Si retains its value "and actually gets better with age. Another year or two it should be pushing 400 hp. I give you, .....the incredible Z4Si!(i-HP variant)

P.S. I'd consider letting mine go for $90,000 or so, but not a penny less than $89,000. After all, I added the hardtop, ... and mud flaps, ...and a stealth garage door opener.