[Perfectlap]

RA-1 are heavvvy and aren't very good for Autocross, but still better than ole' street tires. And they are pricey, one crappy venue with rough pavement and you can shred those RA-1's in a hot day.

I'd avoid full coil overs if they are going to bump you up a class. If you aren't autocrossing I think coil overs are a great upgrade when it comes time to replace your worn out shocks and springs.

I'd get the Kuhmos and a GT3 seat with harness. You can swap between stock and GT3 in ten minutes. A drastic improvement, as one guy at my Autocross once said "they hold you in like a mo..fo.."