Great product. Easy to install.
HMF Quiet Core Insert
- 5 Reviews
- 15 Questions
The HMF Quiet Core is an insert made of 201 stainless steel and installs on most HMF exhausts in seconds. It's designed for sound sensitive riding areas and decreases the sound level approximately 3 - 6dB.
Quiet Core fits the the following HMF exhausts:
- Peformance Series.
- Swamp and Swamp XL Series.
- Penland Series (Torque Range Modifier removed).
- Signature X Series.
Notes: Do NOT use with street bike exhausts; higher RPMs can lead to exhaust issues. HMF recommends re-jetting the exhaust whenever a Quiet Core is installed. Failure to do so can lead to several problems and can damage the exhaust and void the warranty. You cannot use the Torque Range Modifier with a Quiet Core at the same time, only one can occupy the exhaust space.
I dont have a dB reader/gauge so I can not give you the exact dB before and after instullation, but It made a noticable difference. I rejetted carb after instullation and did not notice a power loss on high or low end. Keep in mind you DO need a gasket or it will rattle. It changed the tone of the exhaust aswell but I like it better now than I did before.
Ordered this with HMF Performance Series pipe on my wife's 2006 trx 450er and it performed killer. We got Sound tested by the U.S. Forest Rangers last week at Coos Bay bay. the pipe with the power core insert registered 85db and the limit was 93db at the time.
the quad performed really well with this set up after being jetted with the dyno jet kit. it gave real strong performance over stock.
Just what I was hoping for,quiet for the mountains,easy to pull if need be
I was on the fence with this purchase, but decided to go for it so I would have it in case I went somewhere with noise regs. In short, I could definitely tell the difference on my 660 Raptor. W/O the quiet core, the Raptor took off like a rocket. With the quiet core, it's still better than stock, but much more sedated. The product is very well made and installs in about 5 minutes. I'd give it more stars if it didn't suck as much power away. Good value for the money.
Swamp & Swamp XL Series
Penland Series (Torque Range Modifier removed)
Signature X Series