Don't waste your money..... Engine transplant is the way forward. Don't think silly fast is too achievable with an n/a, have a look at Morgeys 4age build, think he's managed pretty good bhp in his transplanted n/a! I've gone corolla inlet, 4-2-1 manifold, straight through de-cat and induction on my SR, a few people have gone further but dunno if they'd say all the money and effort was worth it? JDM 4efe engine revs a bit higher I think and corolla brown injectors will help if you can find any! Not much gains have been proven though!