The 25% additional gain that comes with a dual 9" diaphragm booster is significant and you'll feel it at the pedal. That said, there are a lot of guys running the single 11" or dual 8" boosters with similar setups to yours who are happy with it. A larger booster and/or different pads may tune the brakes more to your liking and expectations. With everything properly set up, you should be able to achieve lockup with a moderately high level of effort. If you're risking a pulled groin, then there's probably something wrong.
Tobin
KORE3
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Brian Hobaugh SCCA National Tour June 2014
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