Im just about to put a blow thru supercharger setup on my a12, and my mate has turboed a12. He has a 32/36 webber with upsized jets, he runs a low pressure electric carter pump as the problem we were having was the fuel bowl was emptying as the normal engine pump couldnt fill it fast enough!! He is running a fj20 turbo. At first we didnt have it intercooled and it ran at 7-8 pounds no worries. Next we put the intercooler on and run it at 10psi for about 2 months then he got bored so turned it up to 14psi and after a while did a ring land. The next motor we put in he thopught it would be fun to weld the wastegate shut and it ran on 20psi but lasted a night but all that happened was the rocker arms snapped mainly due to too much rpm. SO yeah they are pretty strong for their age!!!