Muffler 4in Inlet/Outlet Quiet Tone

Does a good job sound is very nice in cab and still has good tone outside of truck.

My 2006 Dodge 5.9 Cummins has had 4 inch straight pipe on it for the last few years. It's not my daily driver. Kinda fun around town, but after 2 hours of towing heavy trailers it gets really rough on the ear drums, so I bought my truck the MBRP for Christmas. Wow what a difference. First thing I noticed is how much smoother the engine sounds. It's across the board a more pleasant experience: In the cab, standing next to it while idling, windows down while on the throttle next to block wall... I'd say it's about 3-3/8" clear ID through bore. In addition to that arrayed around the ID are 3/8" tall nozzles that channel some of the gas into the expansion chamber. Effective flow area is that of about a 4 inch pipe. The picture makes it appear that each row is taping down to a smaller ID, but this is due to foreshortening of the image. Each successive row appears to be the same final inside diameter as the first row. The muffler is non-directional (same on both sides). 30 inch OAL, and 6 OD of the quieting chamber. Also the chamber is hollow. There is no noise damping media inside it. Still sounds and flows WAY better than a stock 5.9 Cummins

Straight piped my 2014 6.7 and it sounded badass, but just became too loud. This gave it a nice tone. When you really get on it, it still has a nice loud tone to it but nothing over the top like straight pipe. Direct fit in my 2014 dodge flow pro exhaust.

Works as a replacement for the muffler that came with my MBRP cat back system. The original cracked. This is not any quieter on my ecoboost (reason for 4 stars), it just seems like a packing free version. Has metal baffels welded in instead, still a straight through muffler.

I like many others let my inner teenager come out when I decided to straight pipe my 2007 LBZ Duramax about 2 weeks ago. While you can’t help but smile ear to ear when you do something like that, reality kicks in real quick when you put your wife and 13 month old in the pickup. After doing a lot of research I figured this would probably be the best bet. Immediately you could tell that this “tames” the drone and loud rumble, which in turn made the wife happy. But, you still get a little bit of that famous Duramax whistle at cruising speeds, and enjoy the full force of it when you really push the pedal down. 100% would recommend this product

Good construction, and perfect fit. I installed onto my 2010 Duramax. I definitely helped quiet down the 4” exhaust. It still has a nice mellow sound outside the truck. But not obnoxious like the straight pipe. No complaints though! I paired it with a 17” FTE resonator and it’s quiet as stock inside the cab. Which is what I was going for.

Not quiet. Just a little less drone. Will have to get something different for a comfortable road trip.

Was a bit skeptical from youtube videos it seemed not to quiet down enough but purchased anyways. And glad I bought it! My truck is now quiet at idle still has a nice tone when I get on it almost a bit too quiet tbh but maybe once it breaks in it may get a bit louder. But so far I am very pleased with the result. My vehicle is a 2003 Dodge Ram 2500 5.9 cummins with 2nd gen swap from Fleece and 4in exhaust. Unfortunately I can no longer hear my turbo whistle at idle but being able to cruise at highway speeds and be able to hear my self think is worth it! Lol

This item did what it was meant to do

The muffler on my 2010 duramax sounds the same as the factory muffler. Very quiet in the cab and no drone at all. I tried it with the straight pile and at 1500 rpm’s there was a low drone sound. Once the muffler was added it was gone can only hear the engine purr and the tires. When you start the vehicle it has a lower noise but sounds good and you can hear the turbo. I would buy it again and recommend it to anyone who wants to quiet their truck down. Very happy with the purchase.

Purchased a mbrp exhaust system. It was way too loud and drones. I purchased this muffler to tone down the sound and drone. Worked great and sounds good.

J ai installé 1x j ai une ligne 4 pouces et un kit turbo 2 gen et j en ai rajouter un 2 iem et ses comme d origine mais un peu plus loud 🤙

Installed on 5.9 cummins, it sure knocked some Dcb out of the exhaust. But not quiet. However I did install one on a 6.7 Powerstroke and it worked great.