You mean Legend, right? I don't recall how much boost Legend engines were capable of. Yes, it has forged internals. Gotta leave a few surprises on the set-up, right? Besides, it is up to DPI to decide how much info they want out about the engine specifics before DCS. I trust Josh so much that I purchased the upgrade with virtually no specifics and having never seen, heard, nor driven a DeLorean with the upgrade.