Email me at cplhester@yahoo.com with prices please.

Can you work up a price on the high flow cats and the mbrp catback? I'm military if you offer military discounts. Also shipping would be to 74403. That's not gonna throw a CEL with those high flow cats is it?

The manual system is one of the more aggressive systems on the market. It's just a couple of resonated style mufflers so once they break in I think you would be very happy. Another option to add some volume would be a set of high flow cats. Teamed up with the MBRP catback you would get one killer rumble without adding headers

I dont want to do headers as I do not wish to lose my warranty. My buddy has a 2011 Mustang 5.0 with the MBRP race series catback. I dont expect his exhaust note I would just like the volume. I really liked the flowmaster just wasnt loud enough

The MBRP catback is pretty aggressive. I is probably a bit louder then your Flowmaster system but if you want a real loud set up you'll need to get rid of the factory manifolds and cats. You'd be better off spending the cash on a set of long tube headers that will not only give you the volume you're looking for but also the horsepower!