My 430 just spent several weeks at Tony's shop corrrecting issues after Fabspeed reflashed my ECU to turn off a CEL light from SP header. He was thorough, professional, kept me in the loop and tracked down a difficult gremlin. He is the guy to take your car to in the Boston area.
He is a great resource for us. I'm planning on taking my Cali to him before the bumper to bumper warranty expires to have him look it over closely for potential issues to address.