On visiting me Gibbs the other week he warned me off closed loop lamber set ups.

No doubt the engine will go to him as he's closest & has done all the machine work

I have been offered a gt3076 with a .63 t3 flange & Cosworth downpipe adaptor (direct fitment)
This should see 450-480bhp imo
I'm just concerned if this will surge??

Also why is nobody running 86lb Siemens injectors as these are available at £260 new where 83's are that 2nd hand