I'm running into an issue where after I do 2-4 pull ill get smoke coming out the exhuast on decel. There is no smoke at idle, cruising, or moderate amounts of boost. Mods to include: FP Green, JMF Manifold, HKS 274 Intake cam / HKS 278 Exhuast cam, HKS valve springs / retainers, ARP Head studs, Perrin DP, Buschur exhuast, Perrin Catch Can, ID1050x, and a Walbro 450. Car is tuned on 92 (Hawaii sucks) pushing around the 28-29psi range. Car is an 03 Evo with around 105k miles, also has pistons and rods (was built by one of the previous owners, was told it was a stock bottom end) just curious what yall may think.

 

It's probably unburned fuel. My car does this same - when I pull it hard i can see black smoke. When I drive normal there is no smoke

 

It's not fuel though, it definitely oil, I still retain the stock PCV valve. I'm not sure if it might be a big ring gap? But I'm sure it would smoke during the pull too and not just on decel

 

check your downpipe. I bet its wet inside. turbo seal leaking when the crankcase pressurizes

 

I'll give it a look but it's weird cause it doesn't smoke any other time. Could be crankcase pressure though.