one of the main things to watch out for is the N/A valve springs are like coat hanger wire lol they are very weak compared to the turbo ones. I was running a boosted 4efe in 2001 for the best part of a year till the head gasket failed due to the heater matrix poping. I was running a 0.6-1.0 of boost on a EMB but it was never dynoed so I have no idea what the power was but it was as quick as a stock GT. It was a completely stock 4efe too nothing was changed at all on the engine I just made the stock n/a manifold take a turbo.