You may find a size for RE71s that'll work on stock 17's. But stock 17" front is 205 v 225 for 18s. Some people run a square 17" setup but I think to balance the car properly you'd need some sway bar changes too. Another really good AutoX tire is the Rival S 1.5. (not a lot of size options), And the new Azenis RT615+ seem like a good value. www.WillTheyFit.com is a good resource for comparing different size wheels and tires.
You should be able to find some used OEM 18s for $500+/-
As for the GT3 LCAs, they make a big difference but at a sizable cost. I autoX'd 3 times without them and looked at the shoulder wear then pulled the trigger. I'm sure you'd be fine for a while without them. But start saving and searching for a set to pop up.
Hope my $0.02 helps.
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2022 PCA Zone 7 Autocross Chair
2001 Boxster 986 (base) #414
-PCA GGR: Class Champion AX12 '18, '19, '20; CC06 '21; CC05 '22; PAX 5th '19, 3rd '20, '21, & '22
-PCA Zone 7: Class Champion P14 '18, '19; P02 '20; P-03 '22; PAX Champion '20 & '21
Last edited by BrantyB; 09-14-2018 at 08:33 AM.
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