um..theyre pistons from KMS at honda-performance.com...i believe the brand is supertech or something like that..theyre 9:1 cr with 84.5mm bore. the only reason im asking is because i talked to a guy who was running about 28psi and he locked up the bottom end...he said it was bc he didnt have enuf clearance under that much boost...i wasnt too sure about that so i figured id ask...it says on my piston specs paper the minimum clearance is .00315"