HMF vs. FMF pipes

[rocksrisa]

I would like to get a pipe for my 525 IRS. My friend has an FMF, so I know how it sounds/performs. It seems like the HMFs are quite a bit cheaper. Do they perform as well as the FMFs? How do they sound? These are both the slip-on type.

Thanks!

[birdman7389]

I think they are all so close......just go woth whatever looks best for your price point.

I chose the Stainless Muzzy's :D
They (Muzzy's) were at Dunefest, and made an offer I could not refuse.

I am also happy with the Pro-Circuit on the Pred, but I could not find one for under MSRP for the Outlaw.

[sheriff525]

I have heard at polaris riders.com that the HMF makes some great power. Even with engine upgrades and other add ons. My brother has a full FMF 4.1 and quite frankly he is not very happy with it. The HMF is just really loud.

My advise is wait till the new year when HMF puts out there new pipes. Should be alot quieter while still making some good power and great sound.

[rocksrisa]

Sheriff-

I am new to this ATV game. Do the pipe manufactures come out with new pipes every year?

I removed my spark arrestor in my stock pipe and it sounded so much better. I was at Little Sahara last weekend and could tell an improvement just from that tiny piece of metal.

[ZsPred]

Originally posted by rocksrisa
Sheriff-

I am new to this ATV game. Do the pipe manufactures come out with new pipes every year?

Not really. HMF is just moving forward with a new design on there pipe to meet the new ever decreasing decibel limits while keeping as much power as possible.

I have just gone from a full stainless MUZZYS to an HMF slip-on with OEM header. I wasn't expecting to feel much of an increase, but was nicely surprised by the gains the HMF Sport made through out the band over the MUZZYS. I also have a CP 12:1, 8/06 cam, 41.6 bored carb with Velocity Intake and Vortex X10 ignition. The core in the HMF is quit a bit larger than the MUZZYS, so more than likely compliments the mods better than the MUZZYS.

Don't get me wrong. I like the MUZZYS. It makes good power over stock, and looks awesome. I just think if your gonna mod the internals the HMF is a better option. Plus you cant beat the price!

A draw back for most with the HMF Sport is noise. It is loud. Louder than the MUZZYS. However, I'm somewhere that noise is not a concern.

Chris

[SSJEFF]

Originally posted by sheriff525
I have heard at polaris riders.com that the HMF makes some great power. Even with engine upgrades and other add ons. My brother has a full FMF 4.1 and quite frankly he is not very happy with it. The HMF is just really loud.

My advise is wait till the new year when HMF puts out there new pipes. Should be alot quieter while still making some good power and great sound.

he is not happy with the 4.1? Was it tuned right because I think it works very well.

[rocksrisa]

Originally posted by ZsPred


A draw back for most with the HMF Sport is noise. It is loud. Louder than the MUZZYS. However, I'm somewhere that noise is not a concern.

Chris

Thanks ZsPred. How much loader is the HMF than FMF? I haven't seen anyone with an HMF pipe so I can't tell.

[ZsPred]

The only FMF I have heard is the one Polaris sells, whichever that is.

My HMF Sport is a good bit louder than it. I don't nor have ever used the quite core or spark arrestor in any pipe so can't tell you how they compare or feel.

Chris

[525Outlaw#55]

Originally posted by SSJEFF
he is not happy with the 4.1? Was it tuned right because I think it works very well.





I 2nd that, mine works awesome

[SSJEFF]

Only issue I have with the FMF is the same that I have with all pipes. after 15 hours the packing blows out.

I am considering the CT because there is no packing in them I think.

[rocksrisa]

Originally posted by SSJEFF
Only issue I have with the FMF is the same that I have with all pipes. after 15 hours the packing blows out.

I am considering the CT because there is no packing in them I think.

15 hours sure doesn't seem like a long time before a pipe blows. Are CT pipes all that much better than HMFs? Where is the most cost effective place to purchase a CT pipe without the jet kit?

[sheriff525]

Originally posted by SSJEFF
he is not happy with the 4.1? Was it tuned right because I think it works very well.

Yeah, I tuned it for him. I think it might have been a little rich. Well since I touched on this at polaris riders I wont talk to much. So here is what we had to do. I redid the intake to make it a whole lot better and add flow. I then rejetted it and now it rocks! I took it out for a quick rip....seat of the pants tells me that it may now be faster than mine.

Only a drag race will tell us how much better it is. I will let you know.

He told me that he is happier with it since I re-did his intake.

Other mods we did. Trail vapor computer, gps computer, flexx handle bars, R&D flex jet, and a new intake, full 4.1 with mega bomb. It should be faster now

Running 170 main at 3500 feet, blue needle 3rd notch from the top and fat o ring. Canadain cold weather.

[towman]

i have an 08 525s i have the HMF slip on with carb work and i got so much more out of that wheeler than stock but it is very loud:devil:

[U1arunit]

The Polaris FMF muffler is the Power Core 4 one. I called FMF tech to verify this before I bought one.

Not sure about the packing blowing out in 15 hours though as I have about 30 hours on mine and it sounds the same as the day I installed it. You would think it would get louder..?

[SSJEFF]

Originally posted by U1arunit
The Polaris FMF muffler is the Power Core 4 one. I called FMF tech to verify this before I bought one.

Not sure about the packing blowing out in 15 hours though as I have about 30 hours on mine and it sounds the same as the day I installed it. You would think it would get louder..?

It depends on how rich you have it. If it is tuned correctly then the exhaust will be hotter and blow it out sooner.

It will also happen gradually so you do not notice it so much. I noticed my SRA was bad when I fired up my new IRS with another newer 4.1. A lot quieter.

[U1arunit]

Good point Jeff. I had a 165 MJ in it for a while and ended up going to a 162 now. I would not call it overly rich but I get what you're saying.

[08525IRS]

HMF Pro series on my 09 IRS.. I love it and heard it out performs FMF

[justin1022]

just buy a yoshi. o what a coincodence i have one for sale 250$ any one want it? it will fit the the outlaw 450 and 525 s i also have nerfs and a ac bumper