Brian builds good stuff. I use headers from Brian, but I bought them with uncut unfinished collectors.
I made my own flange area and cross over.
I run a single Forced Inductions T4 flange with 1.25 AR and a 4" exit.
My car is 3200lbs and I nominally run the 1/8th right at 5 flats, sometimes high 4's, in the 140's even with exhaust to the back axle.
I'm just out of airflow to optimize the engine. I'm at 25-26 psi boost and really need around 30 psi.
I'm thinking of a custom V band flange turbo on the B&G headers, which should get me another 5 pounds easy with the same setup.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)