There's lots you can do - pre-cat removal, main cat removal, 2.5" exhaust system all the way through, de-flap the inlet manifold, remove the throttlebody flap, open out the airbox internally, fit a freer-flowing air filter inside, replace the intercooler for a large front-mounted one, you can install a water-methanol injection system, larger turbocharger.. There is lots you can do for more power & torque.
If you actually want to go faster on roads, as opposed to have a higher power figure on the rolling road, then consider a Quaife or Q2 limited slip diff, bigger brakes (4 pot Brembos), upgraded anti-roll bars such as Eibach, the list goes on really..
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