get a chip appropriate for the turbo.

a lot of so called '330' chips are written for T34. using one with a t3 will give you too much fuel at top end (as a t34 flows more air than a t3 for the same boost pressure). this will be detrimental to both the engine and your wallet (too much fuel results in crap economy, fouled plugs, soot build up on head / valves, etc, etc).