All Mustang Enthusiasts have asked the same question at some point – what exhaust should I put on my Stang? Well thankfully, that’s a question that we can help you answer. Sure you can turn to YouTube but let’s face it you usually get some cruddy cell phone camera or decent picture with tons of wind noise. As part of our solution we thought we would give you solid test data and consistent comparisons. We also thought, “Why not start with our 2013 Mustang Project High Impact?” So without dragging this on any further lets get down to business.
We tested the following axle back on stock headers and mid pipe.
The test contained a couple parts to provide you with as much detail as possible:
Check out each tab for notes from both Nathan and myself. We did the rating scale on 1-5 with five being the best. To see our final conclusion, check out the summary tab at the end. Enjoy and we truly hope you find these and our future exhaust test useful in your exhaust selection.
Don't let the words "Stock Exhaust" fool you when it comes to the S197 cars. Ford really did their homework. These cars definitely have a nice deep growl; especially compared to the old days of the 4 catalytic converter mid pipes and huge/heavy factory mufflers. Despite the less restrictive exhaust on the S197 cars they still get better emission rating. It is nice to see automotive technology advancing.
Notes: The Ford Racing Sport axle back had one of the best fit and finishes of all the kits we tested. The chrome tips feature a stamped Ford Racing logo (visible in test video). This axle back was just slightly louder than stock on the inside of the car; yet featured a nice deep tone from the outside. It had no noticeable drone or annoying RPM range while cruising. I gave these mufflers the best all-around drivability because of these features. They are the priciest kit we tested but as with the Bassani you can tell you get better quality with the higher price. The only real complaint I have on this axle back is the fact that it wasn’t as aggressive as the GT500 in overall sound. This is probably from the fact that this is a packed muffler and will get a louder over time.
Notes: I thought this exhaust set up was really similar to the GT500 Axle back with better looking tips. It wasn’t quite as aggressive as the GT500. It being more expensive my choice is the GT500 Axle back.
Notes: This had to be the biggest surprise out of the bunch. The GT500 mufflers are nearly same size as factory but save you about 5 pounds per muffler. The finish looks very close to the factory muffler. The biggest complaint from me on the muffler is that it didn’t have a really nice exhaust tip compared to all the others we tested. The tone and sound were great. Because this was not a “canister” style muffler, we didn’t have any drone. The tone was very aggressive and you also can’t beat the price. With me being a “on a budget” kind of guy this would be my first choice for an axle back. The overall drivability was nearly stock but with a much deeper more aggressive tone. This is a very solid choice for a new axle back for your 2011+ Mustang.
Notes: This was my favorite out of the axle backs tested. It’s aggressive when given gas but quiets down nicely at highway speeds with little to no drone.
Notes: The aggressive tone from this axle back was great on the factory mid pipe and stock headers. The major down side to this axle back was the annoying “drone” you got cruising at about 2k RPMs. To me this is not the exhaust you would want on the car if you did a lot of highway driving. The tips were nice and the overall size of the axle was small which made it easy to install. I was not a fan of the black paint used to coat the rest of the exhaust. It seems like it would chip off or scratch easily. This was the lightest axle back we tested.
Notes: This exhaust is by far the most aggressive sounding exhaust out of the ones tested but it gives up Highway Drivability. This exhaust is loud no matter what speed. It sounds great around town but has a loud drone at 60-70 mph.
Notes: The Hush Power axle back had a deep aggressive tone and managed to eliminate a lot some of the drone of the Flowmaster Outlaw axle back. This axle back still had a drone around 2k RPM but was much more tolerable when compared to the Outlaw axle back. The overall finish was exactly the same as the Outlaw axle back. It had a nice chrome tip but again I just was not a fan of the black paint used to coat the rest of the exhaust. The canister style muffler cut off a lot of weight compared to the factory mufflers and gave more room for installation.
Notes: The Hush Power exhaust gives you a little bit of both worlds. This exhaust is aggressive when in the gas but cruising around town and on the highway it quiets down to a nice level. It does have bit of a drone at 60-70 mph
Notes: The exhaust tone was one of the best out of all the axle backs we tested. The finish was great. The all metal (no paint/coating) finished looked great from any angle. There was a very slight drone on this axle back around 2k RPM. I noticed it just a little less than the Flowmaster Hush Power. Due to the higher cost compared to the Hush Power it got a lower “Bang for the Buck” rating; however, you can tell that the extra money gets you very high quality fit and finish.
Notes: I rank this exhaust right with the Flowmaster Hushpower. The exhaust volume was really close to each other. This exhaust doesn’t have as prominent of a drone at highway speeds.
Below you will find two comparison charts. The first shows Nathan's scores, my scores and an average score for each axle back. The second chart give you a comparison of each exhaust side-by-side. This chart also shows how much louder than factory each test was in percentage form. To make the chart easy to read at a glance, we highlight each test's highest reading in red and lowest reading in yellow.
We ultimately went with the Ford Racing Sport Axle back on Project High Impact. We decided to stick with the Ford Racing theme that the car had taken with the wheels and suspension upgrades. We also felt the GT500 Axle Back in overall looks just did not do Project High Impact the justice it desired. The overall quality and look of the FRPP Axle Back just made a huge improvement to the look of the car.