I ran a HMF utility series on my rincon for 2 years and heres what I learned about the product and company.
For a power adder, this specific pipe kicks a$$! But at the expense of being very loud even with silent core installed. Now keep in mind this was on a big single cylinder not a v-twin.
In the 2 years I had it, I had to send it back twice. The first incident was from the rivets coming loose near the tip. Called them up, they said no problem will fix. And they did. About 6 months later, im riding back from a buddies house who lives about 10 miles away and while cranking down a lil straightaway I notice the pipes tone gets different. Was a little hard to tell since I had my helmet on, so it may have actually happened sooner. So I pull over and the whole freakin end of it is gone! :cuss: The tip, spark arrestor, silent core and every bit of the fiberglass packing. Again, I call them up but this time they say they would have to inspect it first to make sure it wasnt my fault from running lean or drowning it in water. A few days later they call and say they were basically giving me a new pipe at no charge. To say the least I was impressed, but I went ahead and asked them that if wasnt repairable what then. They (Justin) told me that they could sell me a new one for 60% off regular price. To me this is what customer service is all about.
But since getting it back, I only opened the box to see it and was impressed to say the least as it was all new with new hardware. I ended up selling it and replacing it with a FMF. For one reason...Construction. The FMF is all stainless with baffles instead of packing, so basically it wont be falling apart on me. Its less performance but eases my mind of worries.
The HMF is like most all other pipes meaning its aluminum construction and uses fiberglass packing which routinely needs replaced, which alot of times means drilling out factory rivets to accomplish. IMO, these type of pipes do not belong on a utility quad considering the elements we put them through.
my2cents or maybe more like 30cents.