Flowmaster 10 Series

Flowmaster 10 Series Muffler Review

The Flowmaster 10 series performance muffler is designed for race applications where straight exhaust systems are prohibited. The small, single chamber muffler may not even be street legal in certain applications. Upon replacing our Super 44 with the 10 series, we noticed a significant change in tone from the first start up. The idle is deep, but surprisingly mellow. Under acceleration, the 10 series is significantly louder, deeper, and more aggressive sounding than the Super 44.

Muffler: Flowmaster 10 Series, 2.5" single in/out
Part # as tested:
Flowmaster 842515
Price as tested: $59.95


Disclaimer - This review is subjective in nature and includes the opinions of the author. All results may vary considerably by application. This product was acquired at retail value and this is not a paid endorsement of the product(s) featured herein; no compensation was received for the publishing of this article.

There's nothing smooth about the note of this muffler; it made our test mule sound down right mean. At cruising speeds, the muffler is tame but noticeably louder than a multi-chambered muffler. You'll hear the deep exhaust note in the cab, but we did not experience any drone or unpleasant resonance. The single chamber 10 series may have provided a slight increase in performance over the larger multi-chamber mufflers we have tested, but it's difficult to solidify that claim using the "seat of our pants" as a dynamometer. Compared to stock, the muffler provides a significant boost in acceleration and pulling power. The price tag is slightly lower than most of Flowmaster's dual and triple chamber mufflers, and its small size makes mounting it a breeze. If you're interested in something mellow and bubbly, then this muffler is likely not for you. But if you want something deep and aggressive...Flowmaster 10 Series.

This is by far one of our personal favorites. The Flowmaster 10 Series is affordable, aggressive, deep, loud, and produces an exceptionally pleasing exhaust tone at any level of throttle input. The muffler is not for the faint of heart, as it can be clearly heard in the cab. It's also intended for off-road use only, but keep your foot out of it and you shouldn't attract any unwanted attention...unless that's what you're shooting for.

Exhaust clip coming soon...





Overall Rating



• OEM exhaust manifolds, catalytic converters, 2.5" exhaust tubing Y pipe

• 2.5" single in/out Flowmaster 10 series muffler

• 2.5" to 3" transition at muffler outlet

• 3" tubing to 4" tip, side exit in front of rear passenger tire


The Flowmaster 10 series receives an overall 5 star rating because it is literally everything we want in a performance muffler - tone, volume, and value.