the only reason why people get a 4age is because you can abuse it more then any other engine/car.
however that doesn't mean there aren't limits.


you'd be lucky to find a formula Atlantic engine for under 15k actually and that thing only revs to 10,000 rpm from memory

agreed you can get decent power from cams,extractors, exhaust, intake, aftermarket ecu, and itb's and thats pretty much where everyone would stop.
any higher and you will start spending big bux.

besides the corolla is good if you reduce all the problems such as leaking dizzy, leaking rocker cover gaskets, and keep it in check from all the other common problems.
With less then 1000kg of weight your looking at a fast car compared to todays standards on the road. (that does not mean go and hoon)