HMF 6946006 Quiet Core for Exhaust

I purchased a performance kit. Includes HMF exhaust, K&M filter and a HMF fuel optimizer. My new HMF exhaust for my 4 wheeler was just to loud so i ordered this. As per instructions I removed end cap and installed this core and my spark arrestor. The core fit into a machined groove that was obviously there for this core. Without the spark arrestor i could imagine the core might rattle. But instructions clearly indicated the proper installation. Tightened bolts and off I went. Now it has a nice rumble but is not crazy loud. Core did its job. Before the core install my machine sounded like a race machine. After core install i think it sounds more like a muscle street machine, more in tune. Personnally i think the exhaust system should come with tuning options included.I'm happy with the sound and performance. Hope my neighbors don't mind.I recommend HMF products including this one. This is my first HMF set of purchases.

I bought this to replace the factory “quiet core” on my HMF exhaust which broke at the welds. Well a month into using this one, it also broke at the welds. Ended up just getting rid of the HMF and putting on a simple chinese replacement exhaust. Works better and actually helps to reduce noise.

It doesn't quite it down as much as expected, it does quite your atv down in low to mid rpms but in high rpms it get quite loud

Fits and the HMF QS and titan XL. Make sure you add the spark arrester screen to take up any slack in the space and make sure it doesn’t rattle around it works great reduces the volume quiets down the exhaust to a nice rumble!

The quiet core worked its definitely not as loud but it rattles inside my exhaust. Which is just as annoying

The quiet core was very easy to install and it did make the HMF exhaust quieter. Still louder than stock but much quieter and no loss in performance.

although it did reduce the sound, by design it is not a quiet exhaust. do not think you are going to be silent by adding this to the HMF. with that said, the core did calm down the loud pipe.

Installs in about 2 minutes; significantly quieter while still keeping a nice rumble. Getting older and was tired of it being so loud you could hear from 2 miles away.