Get Some Stockies on 16's n put Slicks on it.. n Stock Suspension @ da back if u can so it squats down so u get more grip...
I got 13.7 wif 2.2 60'@ 104Mph.. 3 years ago putting out i say 250HP on 17's wif street tyres..
With the Right Tyre, Suspension n driving skill a low 13's is a possible...
U can try decreasing ur Tyre pressure.. let's 36 to 32 to 28 etc.. n c what's best..
I got told to run stockies wif 225/50 put down to 16-17psi.. do little burnout to warm up ur tyres...