Dzeno had misfires when he got the RBs and that's what I found googling:
Jun 25, 2011
UPDATE: Misfires that were occurring are still present. They are NOT tune related and are still under investigation...
July 7, 2011
UPDATE: Misfires FIXED! I replaced the TMAP, both intake/exhaust CAMSHAFT as well as the CRANKSHAFT (CPS) sensor and the car is back in the game.