the compresion ration is diff on a TT than a NA to take all that boost. So from a start before the TT can spool up the Turbos, at around 3000 rpm the na can hang or take it. but after it goes in boost its gone, and if you take it to 6000 or more rpm then shift, it will be like around 3000 to 4000 rpm, and still in boost so the NA wont catch up.