Lots of STi guys who do a lot of tracking end up using surge tanks. I used one of these in my 02 WRX so I could run almost no gas in the tank. You would be surprised what a small tank like that can do even for long sweepers.
http://www.hyperflow.com.au/index.ph...d=hyast-wrx001
Long sweepers do cause more issues. I think Phil @ Element Tuning (who seems to have disappeared) was getting minor fuel starvation last year even in a stock car when he first started running his car with big slicks.