Firstly I wouldn't brag about racing on public roads, it's not something to be proud of.
Secondly 25bhp might not sound much but it's a 20% power increase, combine that with an extra 30lb/ft the 1.8t will p!ss all over a 1.8 n/a.
As willsgolf suggested, I would wait until you've done the conversion before sorting the exhaust. Personally I'd be looking at getting one of the eBay 3" turbo back exhausts that many members on here use (including myself). In terms of value & performance for money they are unbeatable.
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So a motorway little 30-80/90 rolling start is public roads? I forgot you was there..there is honestly not much difference unless its a launched start, but if figures is all the members here care about then boy.