I had that exact setup on my car prior to getting rid of the 17" wheels. The PS2 in a 225/45/17 will fit just fine and should have a very minor inpack on the speedometer. The sidwall height of the 225 will be slightly less than the stock 205 but over all as you stated the diameter will be the same.
225/45/17 and 255/40/17 is a great setup on the stock 17" wheels. Go for it.
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http://i46.tinypic.com/2qx0rqs.jpg
2001 Boxster Artic Silver / Black Interior
-GT3 Front Bumper w/ Lip
-Side Skirts
-Gemballa Exhuast and Cats
-O.Z. Racing 18" Wheels
--18X8.5Front 18X10 Rears
-Michilen PS Tires 225/40/18 & 285/30/18
-5mm Rear Spacers
-Porsche Door Sills
-H&R Springs
-Powerflow Intake
-B&M Short Shifter
-Pioneer Avic-F90BT Navigation
-Focal Polyglass 165VR3
-Alpine PDX 5 Amp
-Bose OEM Subwoofer & Midrange
-Audio Controld DQXS (DSP)
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