1970 Duster AlterKtion, 4 Link, LS/T56/Turbo and Minitub

Awesome. Sounds to me like you are out of turbo. Tell me the specs on it again. I’m glad you got some hard data about the air filter, I’ve never liked those. The downpipe I would say is not hurting you as much as you might think. The turbine is probably a little small for your engine size. But, and this is a big “but” you now have 580rwhp go have fun with it. Drive the crap out of it and see if you need more. Then change things if you do. I’m betting it’ll be enough to keep you happy for a while.