Sound and flow, it’s as simple as that…
Mufflers are designed to dampen the exhaust explosions coming out of an engine, produce a pleasing sound and maintain the exhaust flow. There are three basic ways to quiet the exhaust sounds, this will give you a general overview of how they work…
Restriction – This kind of muffler captures the sound coming through your exhaust system in a canister and bounces it through a series of pathways, through some absorbing materials, and through a series of baffles to lower the sound levels. These mufflers are the most effective type to silence an exhaust system but they use a lot of your engine’s power just to push the exhaust gases through and retain a tremendous amount of heat that radiates through the floorboards to your interior.
Reflection – Some modern performance muffler companies claim to be able to quiet your exhaust system while still allowing maximum exhaust flow through their mufflers. They do this by reflecting the sound waves through a maze of barriers and chambers in a huge metal box under your car. The flow is pretty decent but the exhaust sounds are turned into vibrations and interior noise (drone) that come up from the floorboards, along with the heat that’s trapped inside, and makes your interior a much less enjoyable place to be.
Absorption – These mufflers are typically a “straight-through” tube design and use a sound absorbing material suspended by a sheet-metal core around the exhaust flow to absorb the exhaust sounds. The consistent layer of insulation makes these mufflers good at quieting the exhaust sounds inside your car while maintaining excellent flow characteristics, until the fiberglass insulation burns out. When that happens you have two chambers creating echoes, popping, and crackling sounds that nobody wants coming out of their ride.
The Porter Mufflers Difference
Porter Mufflers are made from the most robust materials available and fully welded, by hand, for maximum durability. The outer case is 16-gauge 304 stainless steel or ceramic-painted mild steel with 12-gauge end-caps. The core is a 1/8″ thick, 1/8″ gapped, engineered, high-tensile steel spring that is much thicker and stronger than the sheet-metal tubing used in other mufflers. That core is surrounded by 6-8 pounds of densely-packed 434 stainless steel wool and they combine to eliminate the high-frequency sounds, echoes, resonance, vibrations and drone that are so common in other performance mufflers. The straight-through design will give a deep, throaty rumble at idle, maximum performance and sound effects when you step on it, and when you get to a steady cruising speed the sound effects return to a mellow background hum. Porter Mufflers don’t retain heat the way chambered mufflers do so much less heat comes up through the floorboard of your car. No other performance muffler can duplicate the sound, durability, or performance of a Porter Muffler and that’s why it’s been a pro-builder favorite for decades. When it comes time to give your ride its personality give it the best, give it a pair of Porter Mufflers!