Gain from Muffler Swap

Hey guys

I presently have the Flowmaster 40 series original which as everyone know don't flow that well. I was just wondering what kind of gains I would get from swapping in a set of Dynomax Ulta Flows that flow 1133 cfm.

The car makes 403.5 rwhp on a mustang dyno and is a superchargered GT40 crate motor.

Thanks
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You'll pick up 7-10hp, maybe.

Depends on whether or not you use the stickers :P

I tend to agree with Krwy, may pick up a bit more.......

Yup, I will add the stickers so that should be another 15 or so eh !

:)