Re: Best gen STI for time attack
+1 for TBAG's advice. Spot on.
If you must have a Subaru, plan on spending some serious dough and face reliability issues if you want to be 'reliably' competitive. With the money it will take, there are other platforms that will take a lot less time (for the same money) to keep them on the track. I see a lot of road course guys get frustrated and go to GT3s, as you spend the same money keeping a Subaru intact and far more often need to winch it onto the trailer at the end of the day.
I love these cars, but knowing where their natural capabilities lie will save you some serious money and frustration.