Well, I haven't had my GTT (tiptronic) long, but with a full A'PEXi exhaust, front pipe and Blitz panel filter I ran 177kW at the wheels. The problem is that these combine to push the psi to 10 (as oppossed to 7/8 stock) and hence rich and retard kicks in and almost makes the thing undrivable under hard accleration. This in turn contributes to fairly poor fuel consumption as well, less than 350 a tank. Hence, an intercooler, if someone can enlighten me on specifically why, may be of benefit here.