13 Products
Mufflers
An exhaust muffler is a component of the exhaust system designed to reduce the noise produced by the engine's exhaust gases. The main functions of an exhaust muffler are as follows:
| Noise Reduction |
The primary purpose of a muffler is to dampen and reduce the noise generated by the exhaust gases as they exit the engine. |
| Backpressure Regulation | A properly designed muffler also helps regulate backpressure within the exhaust system. Mufflers are designed to balance noise reduction with maintaining an appropriate level of backpressure. |
| Emissions Control | In modern vehicles, mufflers may also incorporate catalytic converters or other emissions control devices. These components help reduce harmful emissions by promoting the conversion of pollutants into less harmful substances. |
Some common types of mufflers include:
| Chambered Mufflers | Straight-Through Mufflers | Resonator Mufflers | Performance Mufflers |
When choosing a muffler, it's important to consider factors such as the desired sound level, performance goals, and local noise regulations. Additionally, compatibility with the vehicle's exhaust system and emissions requirements should be taken into account.
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Let customers speak for us
from 5081 reviews
Love spelab products diff cover is so mint the charge air cooler pipes look sick and the rad shroud pops when you open the hood Looking at other products but seem to be unavailable at the moment 🤘
These guys are great. They have fast shipping and their product is great. I wish they had more parts for my truck but they cant make them all i suppose. They added quite a bit of HP to my build. It turned out great
Best investment i bought and proud to have from SPELAB
Instructions were great, could
Be more detailed but overall great product, install wasn’t bad at all, unfortunately snapped oil dipstick tube following instructions but other than that I would say the plugs in the intake could’ve been put in prior rather than leaving room for install error
Very nice
Good products great pricing
Works great, find out how to wire it on YouTube if you aren’t sure, super easy though only two wires
this 2017 3500 Ram with now 111274 miles was used by PO to pull 5th wheel and now it pulls a 30 ft airstream TT.. I change out fluid at 96K with OEM cover and started looking for replacement.. this is great with magnetic drain plugs which is a great help as we change out oil every 35K miles as we tow a lot..
This new alum cover with fins is much like the AAM unit used on teh HO engines from factory with not quite the amount of and placement of fins but in the end this accomplished the goal of keeping the fluid cooler especially when towing.
One thing i did notice was the no actual instruction on what was proper level of oil in sight glass.. Usually on OEM cover you fill till the oil dribbles out the fill plug on cover and that if good..
on this model I noticed the sight glass was lower than the OEM plug determining the level need to be not the middle of the sight glass but at the TOP of the sight glass.. just saying.. the inside has fluid diversion fins so help move the oil to ponion gear and the side bearing on housing..
The fit and finish are great and it looks super cool now in the alum color.. I though about spray painting and sanding the edge of the fins to have that nice contrast but left it silver.
highly recommend and the price is right..
Order came in a few days earlier than the expected delivery day pretty easy install it makes the engine may look a lot better
I purchased a pair of Spelab Electric Cutouts for my BMW. Everything in the kit was shipped quickly, was perfectly packaged and the quality of their product is top notch. I installed the cutouts and I couldn't happier with the way they work. I was even able to pair the remote to the Homelink buttons to open and close the valves.
Hoping to gain a sponsorship soon I use yalls parts on my personal build and customers builds
Very good quality kit and was easy to install!! I highly recommend it!!
Excellent quality product that definitely delivers a difference in throttle response. You can tell that the engine is breathing much better. I highly recommend this to everyone out there. Shipping was fast too!! And to top it off, the dreaded engine killing grid heater plate is gone for good! Look how bad the grid heater was after only 46,000 mi. You can barely see thru the grids. Ridiculous design by Cummins/Ram. They should be ashamed for putting that piece of junk on such a good engine. Next up, turbo tubes!
Fit my 08 6.4 extended cab just fine. Sounds great with a 5x7 tip
I have always used there products and customers always are happy
Performance Exhaust Mufflers FAQ
Chambered mufflers use a series of internal chambers and baffles to reflect sound waves, providing a deeper tone and more noise reduction. Straight‑through (or “glass‑pack”) mufflers have a perforated tube wrapped in sound‑absorbing material, offering less restriction and a louder, more aggressive sound. For diesel trucks, straight‑through designs are popular because they minimize backpressure while still meeting most sound‑level preferences.
On a stock diesel, swapping just the muffler typically yields minimal horsepower gains (0–5 hp). The real benefit comes from reducing backpressure, which can improve turbo spool‑up and throttle response. Significant power increases require a full exhaust system upgrade (including downpipe and delete pipes) paired with tuning. A performance muffler is best seen as a sound‑and‑flow improvement that complements other modifications.
- Match the muffler’s inlet/outlet layout to your existing exhaust piping. Common configurations are:
Center‑In/Center‑Out – for single‑exit systems where the pipe runs straight under the vehicle. - Center‑In/Dual‑Out – for trucks that want a dual‑tip look; requires a Y‑pipe after the muffler.
- Offset‑In/Offset‑Out – used when clearance around the fuel tank, suspension, or frame requires the pipe to be offset.
Measure your current pipe diameter (usually 3″, 4″, or 5″ for diesels) and choose a muffler with matching inlet/outlet sizes.
These are model designations from popular muffler brands (like Flowmaster) that indicate internal design and sound characteristics:
- Super 10 – aggressive, loud, straight‑through design with minimal silencing.
- Super 44 – chambered, deep and aggressive tone, louder than stock but not as extreme as a Super 10.
- 50 Series – chambered, moderate sound level, a good balance of performance and daily‑driveability.
Choose based on how loud you want your truck to be and whether you need to comply with local noise ordinances.
Yes, universal mufflers are designed to be welded or clamped into any exhaust system that matches their inlet/outlet size and configuration. However, you may need to cut your existing pipe and possibly add a short section of pipe to achieve proper fitment. Vehicle‑specific mufflers (often called “direct‑fit”) include all necessary hangers and brackets for a bolt‑on installation, saving time and ensuring perfect alignment.
Stainless‑steel mufflers resist corrosion far better than aluminized‑steel units, especially in regions that use road salt or in coastal environments. For diesel trucks that see long‑term use, stainless steel is a worthwhile investment because it won’t rust out, extending the life of your exhaust system. If you plan to keep the truck for many years, the added durability usually justifies the higher upfront price.
