Matt your asking me questions I don't no and don't need to no.
All I'm doing is giving you reasons why I chose a single tb, why don't you give hypertune a email tell them your aiming for 1300bhp and ask them what they reccomend I'm sure they will be able to answer all your questions.
Hypertune said multi tb become very restrictive at 400hp.
Rich at amt had 750bhp at the flywheel and crap old road tyres he also had 19" wheels.
Considering I have 50hp more and better tyres if say I'd be a low 10 high 9.peak power doesn't mean a great deal Matt its the area under the curve what makes a car fast.
I'm going to do a Santa pod trip and run my car see what it does