Before we assume that it's the lack of a cat. that is causing this (I'm a huge proponent of catted downpipes, BTW), remember a couple of things:
1 - A cold cat. doesn't burn off anything; there is a cat. warm-up mode that richen the mixture in order to warm up the cat. so that it can start to work (this is what the crackle and pop tunes hijack). Even if this was an catless downpipe issue a catted downpipe would have the same problem on a cold start. This is why, on a cold day, our catted cars smell rich when warming up.
2 - A cat.'s purpose is to burn off the *small* amount of unburned hydrocarbons that make it out of the combustion cycle. It's not going to help reduce a mixture that's so rich that you can see smoke nor a oil sealing problem that introducing enough oil that the car is exhaling smoke. A properly running catless FiST might stink (or smell lovely, depending upon your taste in odors) but it won't visibly exhale smoke as is the OP's.
The catch can is filling much more quickly now (since stock turbo, 1300 miles ago). I can't see how the turbo would increase the amount of oil in blow-by unless the oil seals had shit the bed and, in that case, OP's FiST would be billowing smoke and the smoke would increase as does oil pressure and/or boost. In this thread OP says that the smoke smells like oil but at the end of the video OP says that it smells like gas. I'd wager that it smells like gas because OP is running catless but the smoke is due to oil; the mixture would have to be super rich to cause that much smoke and OP's dyno and butt-dyno suggest that that's not the case.
My vote is that this something with the PCV system.
1 - A cold cat. doesn't burn off anything; there is a cat. warm-up mode that richen the mixture in order to warm up the cat. so that it can start to work (this is what the crackle and pop tunes hijack). Even if this was an catless downpipe issue a catted downpipe would have the same problem on a cold start. This is why, on a cold day, our catted cars smell rich when warming up.
2 - A cat.'s purpose is to burn off the *small* amount of unburned hydrocarbons that make it out of the combustion cycle. It's not going to help reduce a mixture that's so rich that you can see smoke nor a oil sealing problem that introducing enough oil that the car is exhaling smoke. A properly running catless FiST might stink (or smell lovely, depending upon your taste in odors) but it won't visibly exhale smoke as is the OP's.
The catch can is filling much more quickly now (since stock turbo, 1300 miles ago). I can't see how the turbo would increase the amount of oil in blow-by unless the oil seals had shit the bed and, in that case, OP's FiST would be billowing smoke and the smoke would increase as does oil pressure and/or boost. In this thread OP says that the smoke smells like oil but at the end of the video OP says that it smells like gas. I'd wager that it smells like gas because OP is running catless but the smoke is due to oil; the mixture would have to be super rich to cause that much smoke and OP's dyno and butt-dyno suggest that that's not the case.
My vote is that this something with the PCV system.
