Rated 5.0 Stars By Real Truck Owners
32 verified customer reviews across the Thunder Muzzle lineup — every one of them 5 stars. Here's what owners, reviewers, and the diesel community have written.
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★ 5.0 / 5.0
Average rating across both Thunder Muzzle sizes
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32 Verified Reviews
From real customers via Junip verified purchase reviews
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Covered By The Press
Featured by Diesel Army, Dark Iron Diesel, and diesel truck forums
In The Press & On The Forums
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Diesel Army
Diesel Army's write-up called the Thunder Muzzle a no-compromise answer to an old problem: you no longer have to pick between straight-pipe sound and a quiet, comfortable ride — one muffler does both at the turn of a switch.
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Dark Iron Diesel — Dyno Tested
Kyle at Dark Iron Diesel strapped his truck to the dyno to answer the big question: does the muffler cost you power? Result: no measurable difference between quiet and open modes — roughly 390 hp and 810 lb-ft both ways.
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avvblanc01 — Full Written & Video Review
One of the first in-depth reviews on the market covered everything: sound clips in every mode from stock-quiet to full straight pipe, the installation process, the materials, and the manufacturing story behind the product.
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Cummins Diesel Forum
In a 2,400+ view thread, long-time members shared exactly the problem the Thunder Muzzle solves — one owner missed his 4-inch straight pipe but admitted the drone gets old fast when towing his camper. Adjustable sound means never choosing.
From Verified Thunder Muzzle Owners
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★★★★★ — Verified Buyer
Fantastic muffler!!!Excellent communication from the company. Product arrived packaged nice and secure. Muffler does exactly what it says it will do. Very nicely built. Couldn't have asked for a nicer product or customer service experience. A+ / 5 Stars
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★★★★★ — Verified Buyer
Money well spent! could tell from the moment I opened the box that this muffler was built with pride and attention to detail. The instructions were very easy to follow and were obviously written by someone who's "done it before". After unsuccessfully trying 3 other mufflers to try to cure a nasty drone on my 25 L5P I decided to spend the money and try a Thunder Muzzle. I was not disappointed!!! It made the drone 90% better. I really like the fact that I can quietly come and go from my subdivision and keep the neighbors happy. If you're contemplating buying one just buy it, you won't regret it!!
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★★★★★ — Verified Buyer
Muzzler of the beast. Super easy to install! Amazing the difference it makes, and allows me to run straight though exhaust when I wanna get rowdy, and muffled when I wanna be civilized. Makes towing enjoyable again. Highly recommend this product. Super well made too! You definitely get what you're paying for with this muffler.
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★★★★★ — Verified Buyer
Get one already! Have had this muffler on my LBZ for about 6 months and absolutely love it. Normally keep the valve open because the sound of the straight pipe is amazing but towing or really long trips the drone can get annoying but it can be fixed at the touch of a switch. Thank you for an amazing product!