Yeah you could say ive had issues, ive cracked the standard manifold and blew the standard turbo, there was an issue for the previous owner who had the ECU replaced at a cost of the dealer he bought it from for $5000 they were originally quoted over $15000! But otherwise those few mods you have mentioned will open up the car alot, just replace the cat for a high flow one while you are at the exhaust as they can be rather restrictive. There a few differences to the Sportivo and the levin. The clutch is expensive, dont look at buying a gasket for the turbo to manifold i found this out the hard way $183 for a triangular 10cm multilayer metal gasket lol. (Shhhh get it from Subaru :P) the engine is expensive the turbo is expensive, suspension is expensive and brakes arent too bad lol the list does go on. Honestly its rly not as bad as i make it out to be just buy the extra parts aftermarket and stronger :P Karl.