Best rear gear for a kenne bell ?

[" Red GT "]

I've got now 3.73 on my car with a kenne bel Mammoth supercharger , As per a tunner what he told me , The best gear is 3.55 u will get more torque and horse power , I've got now 511 RWHP and Torque 425 , 14 or 15 PSI .
I saw the torque very low !!! :??:

My car Mustang GT 2007 A/T .

What is the best gears do u think for me ?
Is it 3.55 or 3.27 ?

Becase I'm feeling 3.73 very bad with kenne bell .

 

[stkjock]

3.73 with a 27" or taller tire.
4.10s with a 28" tire
gears will not affect the torque the motor makes - a shorter gear (higher numerically) will increase the multiplier effect. if you go to a longer gear (lower numerically) you'll lose some acceleration.