howarmat

I agree with the above....330-335 is more like it.....You loose 15 by taking the ford tune out so you have to start from about 305.....you might get 40 from a tune but that would be 32-34 RWHP from a CAI and Tune which is highly unlikely.

AmericanMuscle4.6GT

this is the only way i could see it happening: a huge open CAI like the JLT2, a custom, very aggressive dyno tune, the x pipe, and axlebacks, and dynoed under decent conditions, then yes, i think it is plausible that a GT mustang will make an honest 345 crank hp.

ilmor

Thanks for your comments, everyone. I emailed Brenspeed also to see what they have to say.

Daniel60

I asked once and Brent told me I was putting about 350 to the crank with the cai/tune and pullys.

Menace

Well, if you're making 300 RWHP... They say you lose around 15% of power through the drivetrain. So you do the math and that's 45 HP. So 345 HP at the crank doesn't seem far fetched. I made 300RWHP with a C&L Intake and 93 Octane Tune, along with an O/R H pipe. So I think the Shelby GT is going to need a little more then just intake and tune and an x pipe.