Ok...my first post is a little harsh - but the op did mention track use wheels (18 inch not being the problem) but wouldn't it be objective to go with a wider stance than not to?
For example > Stock with no Sport Package 18" x 8.0" (front) and 18" x 9.0" (rear) > 225/50WR18 (front) and 245/45WR18 (rear)
And Sort Package > 19" x 9.0" (front) and 19" x 10.0" (rear) (Rays wheels) > 245/40WR19 (front) and 275/35WR19 (rear)
Basically, it seems like you're going backward especially with the statement about using 225 all around... :-S
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