TBH even with more boost to see you running closer to 350bhp even, more boost is probably the last thing you would want on a standing start as you will more than likely be spinning up the entire rev range through 1st and good majority of 2nd. Rolling is a different story. See if you can grab his reg and find out which engine variant it is. I think you'd be struggling against even the 4.0. Have to pray he can't launch for shit.