Looking for some more opinions and experience based knowledge on piecing together a B series tranny. I will be swapping gears between an S1 (B16) and A1 (LS) plus adding LSD. I am not sure what the best gearing combo will be for a street turbo car.

One opinion I was given was to use the LS 1/2 and FD, and the B16 3/4/5 but I like the idea of keeping my LS 5th gear. Most of my driving is 70+ on the highway and the RPM is already almost too high with the straight LS gearbox.

Any other opinions on what the best setup would be so I can get this build underway would be appreciated.