4-TEC quiet?
Are you just pulling our leg? The 1503 is a powerful engine and although the decibles are a bit lower than the 951, it's still pretty noisy? But I do wish I could pop one into my XP.
At my shop, I've got a spare 951 I've been working on. I'm hoping to mod it into an old 96 model Challenger boat. I got it after a fire in the engine compartment, so I'm replacing the electricals right now with the boxes from the 951.