Dies it sound like a 5.0?

No, we can't make these v6 motors sound like a v8 but these mufflers have an unique tone to it. They sound raspy past 3,000 rpm but an intake and shorty headers will deepen the tone a bit and you can also add a cheap x pipe and dynomax race bullets to deepen the tone ever more. That's the closest you'll get to a v8 but it will still be a mile away from sounding like it.. The unique tone that I'm talking about is like a GTR. Also if you buy these it's an easy install. You won't find an exhaust that sounds like this. For warning if you have a v6 mustang don't do a cat delete because it's completely a nasty raspy cringy roar past 2000 rpm.

Will this fit an automatic?

Yes, the exhaust fits manual or automatic transmission 2011-2014 V6 Mustangs.

how much HP increase using roush axle back exhaust ?

This system is more for exhaust sound and looks. Axle-back systems do not have large performance impacts. It will relieve exhaust back-pressure and allow the engine to "breathe out" better. How much that helps is case-by-case.

2011 2014 Mustang Roush V6 3 7 Axle Back Dual

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Description

🖤 Turn heads and drop jaws with every rev — the stealthy power upgrade your Mustang deserves!

BUILT TO LAST - Durable 409 stainless steel pipes and muffler paired with corrosion-resistant 304 stainless steel black tips.
POWER UNLEASHED - Open-chambered design maximizes airflow, reducing back pressure for a serious horsepower and torque boost.
SIGNATURE SOUND - Aggressive, drone-free exhaust note that commands attention without cabin discomfort.
CLEAN COMPLIANT - Maintains factory emissions standards so you can upgrade without compromise.
EFFORTLESS UPGRADE - Direct fit for 2011-2014 Mustang 3.7L V6—no modifications needed, just bolt on and roar.

The 2011-2014 Mustang Roush V6 3.7 Axle Back Dual Exhaust Kit features a unique open-chambered design that enhances horsepower and torque by improving airflow and reducing back pressure. Crafted from durable 409 stainless steel with powder-coated black 304 stainless steel tips, it offers a sleek look and aggressive sound without affecting emissions. Easy to install with no vehicle modifications required, it fits both coupe and convertible models and comes with a 3-year limited warranty.

Specifications

ASIN	B00KY4YZW6
Best Sellers Rank	#1,957,074 in Automotive ( See Top 100 in Automotive ) #74 in Automotive Replacement Axle-Back Exhaust Systems
Brand	Roush
Customer Reviews	4.9 4.9 out of 5 stars (16)
Date First Available	March 8, 2013
Is Discontinued By Manufacturer	No
Item Weight	26 pounds
Item model number	421145-BLK
Manufacturer	Roush Performance
Manufacturer Part Number	421145-BLK
Model	Axle Back Exhaust with Black Tips
Product Dimensions	21 x 24 x 10 inches

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