I have I have G-force racing shoes and really notice a difference. I only wear them at the track because of the thin sole they hurt my feet.
I think that was the reason McRat cut another .10 off his times today

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2002 02 Z06 444 rwhp/419 tq AFR H/C 11.36 @ 120.67
2005 GMC "Casper 2" 2500HD 4wd Xcab SB Duramax 10.59 @ 128.9
2006 GMC "Wendy" LBZ CC/SB 12.65 @ 105.78