Shop Peterbilt 379 DPF & Mufflers

Time to upgrade your muffler? 4 State Trucks has you covered with a wide selection of Peterbilt 379 mufflers and DPF parts. Shop our custom, chrome, and aftermarket options in various styles. We have you covered with high-quality solutions that will fit your budget.

Peterbilt 379 DPF & Mufflers

Looking to upgrade or replace your worn-out Peterbilt 379 muffler or DPF system? We ve got you covered. This extensive collection of aftermarket parts is built specifically for the iconic Peterbilt 379 truck. Whether you're chasing better engine performance, cutting down on backpressure, or just replacing a worn-out unit, you'll find the right fit components here. Inside this product lineup you can shop for: - Aftermarket mufflers for the Peterbilt 379 semi truck year - DPF muffler units and replacement filters to remove harmful particulate matter from exhaust gases - Heat shields, stainless steel covers, and performance parts - Heavy duty mufflers and commercial truck muffler setups that dampen and absorb noise created by the engine's exhaust Every aftermarket Peterbilt 379 muffler we offer is designed for a clean fit and long life. From OEM-alternative heavy equipment mufflers to full DPF systems, these parts are made to handle the heat, pressure, and miles your truck puts in every day. Need something that meets emissions regulations but doesn’t kill your flow? Our heavy duty truck muffler options help you stay road-legal while improving exhaust performance alongside your elbow components. So, whether you're fixing a problem or customizing your rig to achieve a high-performance exhaust system, you can start here and shop with confidence. Quality mufflers and diesel particulate filters can deliver a more comfortable driving experience for an aging semi truck model like the Pete 379. And new stainless steel chrome stack tops can top off your exhaust system overhaul.

Frequently Asked Questions About Peterbilt 379 DPF & Mufflers

Will these DPF and muffler systems fit my specific year Peterbilt 379?

Most aftermarket DPF and muffler systems are designed to fit Peterbilt 379 models from 1987-2007. However, there are important variations between pre-2000 and post-2000 models due to frame rail spacing and exhaust routing changes. Always verify your truck's specific year and engine configuration (Cat C15, Cummins ISX, etc.) before ordering. If your 379 has been stretched or modified, you may need custom brackets or extensions.

What's the difference between aluminized steel and stainless steel options?

Aluminized steel mufflers typically last 3-5 years and cost 40-60% less than stainless steel. They work well for trucks in dry climates or those parked indoors. Stainless steel systems last 7-10+ years and resist rust better in wet, salty conditions. For trucks running year-round or in coastal areas, the extra investment in stainless steel usually pays off. Both materials provide similar sound reduction and performance.

How difficult is the installation, and what tools will I need?

Installation typically takes 2-4 hours for someone with basic mechanical skills. You'll need a socket set (including 15mm and 17mm), penetrating oil for rusty bolts, exhaust hangers, and clamps. The hardest part is usually removing old, corroded components. Many drivers report needing a sawzall to cut out old pipes. Having a helper makes aligning heavy mufflers much easier. Professional installation runs $200-400 if you prefer not to DIY.

Will aftermarket mufflers change my exhaust sound, and are they DOT compliant?

Quality aftermarket mufflers maintain similar sound levels to OEM while often providing a slightly deeper tone. Look for mufflers rated at 80-85 dB to stay DOT compliant and avoid citations. Straight-through designs are louder than chambered styles. Most reputable brands clearly mark their products as DOT approved. Avoid "off-road only" mufflers unless you're certain they're legal in your operating areas.

Do I need to replace the entire exhaust system or just the muffler?

If your pipes are in good condition (no holes, minimal rust), you can often just replace the muffler itself, saving $300-500. However, if you see rust holes, loose brackets, or your system is over 5 years old, replacing the complete system prevents future failures. Check the flex pipe especially - it's a common failure point that can cause exhaust leaks if not replaced when worn.