Hard to say accurately how fast you're going to go without any idea of 'real world' power to weight (e.g trapspeed), flywheel horsepower doesn't always translate linearly into lower times, how that power is delivered can make an enormous difference.
I've seen a 13.2 with ~155whp on a CT9 and I've seen plenty of examples of 250+ HP peaky cars with big turbo's running slower.
Biggest reduction in times is going to come from practice and making some incremental changes to car set-up and strategy on launch etc
Go and race, have some fun and post up your full timeslips. Based on those I'm sure we can offer some far more constructive advice for getting quicker