I've emailed him a few times recently (last few months) and got one response out of three emails; he answered fairly quickly after the second email, so maybe you just have to get lucky and he happens to look at his emails around the time you send one... Maybe put something in the title like "Cadillac E85 Tune", or something that's simple and kind of stands out, and then email him every couple of weeks or something.
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Overkill/Self Tuned; Mace Camshafts; K&N Typhoon Cold Air Intake; Ported 80mm Throttle Body/Intake Manifolds/Manifold Spacer; Solo Performance High-Flow Cats, Cat-back Exhaust; Vitesse Motorsports Throttle Controller; Elite Engineering E2 Catch Can; BC Racing BR Coilovers; JPSS Delrin Radius Rod Bushing Inserts, Sway Bars; Pegasus Aluminum Rear Cradle Bushings, Camber/Caster Plates; Z/28 Toe Links, Trailing Arms, Upper Control Arm Bushings, Rear Shock Mounts