205 is the width. I do not think its a good idea to go wider. I don't think that what you wanted based on your comment about the speedometer.
65 is the sidewall height. I think this is what you wanted to change and I can't fine a tire with a larger side wall on a 15 inch rim.
I did some looking on tirerack.com and with a 15inch wheel I can't see any other options.
Based on the average 3S owners comments on the car lowering the car might fix the issue. The common complaint is the wheel gap above the tire.
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1998 3000GT SL - 1992 Dodge Stealth RT/TT
www.3si.org - 3000GT/Stealth International
www.mi3si.org - The Michigan chapter of 3SI
The 3S wikipedia www.3si.org/wiki (A work in progress)
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