I have spent a lot of time this year with 8bu-00,s in my SRX & have found them to run the most consistent & with a low finish angle on the helix with lots of tip weight they still pull great top end. I have talked to a couple of local real good tuners & they allways go back to the 8bu,s. They just don,t have the snappy backshift but neither will HH,s or supertips when set up for drag racing. I dunno.....I just keep going back to 8bu,s & in my tuning parts I have heelclickers(3rd gen & pivoting arm) heavy hitters & supertips.