Hello everyone! For fellow USA Testarossa owners who don't have to worry about emissions any more (over 30 years old where I live), here's something I recommend... First off, when my TR would start up, it would be so cranky: clattering, clapping, sounding blah. When it warmed up, it sounded better. I thought it was just because maybe my oil was too thin and took a little while to lubricate the clattering pieces, etc. I was reading somewhere else in this forum about how, when the aux air pump is going bad, you'll hear a bunch of clattering while cold (when warmed up, the air pump switches off) I noticed the clattering would greatly decrease if I covered the air intake on the little black air filter on the driver's side, above the oil reservoir. This feeds air to the air pump. That air pump exists to push extra oxygen in to the exhaust to help burn any unburned fuel in the exhaust. Anyway, I made an executive decision, climbed under the car and cut the belt that drives the air pump... And WHOA! The engine sounds so much nicer on startup, and even in general! Smoother idle, even when warm (but that could be the power of suggestion) And I even think I have more power now, too! So, in closing, if you hear clattering on cold startup and it goes mostly away if you cover the little black air filter on the driver's side, and if you don't need to be tested for emissions anymore, cut that belt and you'll be sooo glad you did!