t3 will punch a 310-320 anything above a T34 is needed, if you want it punchy use a .48 housing for 350bhp, for 370bhp a .55 and upto 400bhp. 63, if you want more you then need a T38 or GT series.
You turbo is worth £200ish, a T34 will start at £300ish and go as much as £450 dependent on housing size and condition.

Greens are on there knees at 350, so its then greys or evenbetter blacks, either 55 or 83lb.

What ever you do your car will need a new chip