First of all awsome choice of engine to fit to an 86. These engines are one of the tuffest N/A motors around and can produce some serious power for a 2 litre engine. I was toying with the idea myself but because of the High comp setup its best to do work to the motor before bolting a turbo on the side or you will have problems when pumping boost into it, any more than about 4psi. They run 11.5.1 compression ratio and this is way to high for a turbo engine. I would put a set of pistons that Toda make and drop it to like 9.5.1 and a set of rods to make it reliabe and be able to put 20+ psi in it with big power gains. Beu Yates trd AE86 is on youtube which is fitted with a Beams 3sge turbo engine. Hypertune make an awsome intake manifold for the beams turbo engine but you will pay for it.