dont think of the t/c as a special addon for the xfire. think of it as you would modding any race car. t/c allows higher rpm launches which allow quickewr 60ft times which relate to faster et's.

the top mounted intercooler can be made its a matter of money. check out speedriven and search some of their top mounted installs. all custom made and not cheap!
exhaust mods again not cheap but we are looking at any gains we can find.
of course you can send your engine to speedriven and have the cylinders bored to 3.7 litre!! that will get you into the low 11's!