TB you can use Perdana Sei TB 55mm (4G92p only 50mm) and port match with the intake manifold
For upgrades can do PNP cylinder head, a nice performance street camshaft, 4G92p pistons for high compression NA setup, LCP and lastly tune it with minimum a piggyback. Should easily net you around 12x whp easily with torque in the 15x to 160Nm range. I didn't state any adjustable cam pulley is because if you manage to find a very nice camshaft that runs good at base, ACP is not needed since you are using a 4g92p ECU the rev cut should be at 6800rpm only unless you remove it by rechipping :)
For upgrades can do PNP cylinder head, a nice performance street camshaft, 4G92p pistons for high compression NA setup, LCP and lastly tune it with minimum a piggyback. Should easily net you around 12x whp easily with torque in the 15x to 160Nm range. I didn't state any adjustable cam pulley is because if you manage to find a very nice camshaft that runs good at base, ACP is not needed since you are using a 4g92p ECU the rev cut should be at 6800rpm only unless you remove it by rechipping :)
