Performance Manifolds for the F355

Hi Guys,

does anymone has experiences with the manifolds from
TubiStyle for the F355 ( 5.2 system ) ?

On their website (tubistyleusa.com ) they offer two kinds of
manifolds:

Manifold for 355 5.2 F1 with thermal insulation

and

Manifold for 355 GT ( no insulation )

Both are for racing use only.

Does anywone has experiences with these manifolds ?

Is there more power and torque ?

What do they cost ?

Andi