the t5 will go with an adaptor plate (about £200 to get made) the 24v is a much stronger engine as it comes with a billet crank and forged pistons as standard, and was built to take 500 bhp from the factory. the heads on the normal 2.9 seriously restrict any major performance gains that can be made. oh and at 7 psi with the 24v you'll be looking at over 360 brake.
Speak to top boss tuning for any more info.