If you really want to rip, forget about those crummy Polini pipes, save up an extra hundred or so dollars and buy a Motomatic N8P. All around awesome pipe and they're sturdy as hell and will last you forever. I'll be conducting some R&D with that pipe on my VIP soon. I'll let you know how it performs. If you want some instant pipeage though, just weld a biturbo chamber or something similar onto your header.
You can't go wrong if you get the PHBG dellorto set-up with the Polini side intake, the only crummy thing is that the intakes only have an 18mm inside diameter. In the meantime though, just remember to make sure you aren't running too lean with that stock dellorto without an air filter. However, those kits are tanks and can take a lot of abuse. You got a damn good deal on that kit! Good luck!