Haha, I don't know where you heard that but it's complete bullshit. For one, If you have a Honda making upwards of 600 hp I would assume you would be there for the dyno session. Shad wouldn't just know how much HP your car is gonna make without putting it on the Dyno....so how would he detune your car? You'd be there watching. 2. I think Shad's pretty comfortable with the fact that his car is faster than yours, regardless of if your Honda made 800 hp....he'll beat you. 3. Your car really isn't going to make more HP than Shad's.
I'm willing to bet some ricer prolly came up with a story about how his turbo Si should have made 700 hp but when he put it on the dyno, and his friends were there to see it didn't make half that....so he blamed Shad.
Shad is an A+ guy, Abacus is an A+ shop. Shad knows the ins and outs of a Honda better than most of you prepubesant boys know your crotch. He's a business guy. Making your Honda make power is his business.