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What's your alignment look like? You're going to want more negative camber in the front if you're at OEM alignment specs.
Don't stagger your wheel sizes. If you want to stay in SCCA C Street, you have to stay 17x7, but you can go lighter. Most autocross folks are running 17x7 or 17x9 depending on which class they're in.
18" will make your ride harsher, may likely increase unsprung mass, and slightly improve steering response. 17" is better for ride quality and easier/cheaper to keep the weight down. Tires are also significantly cheaper in 17.
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