I got the GYTR because at the time it and the HMF were the only ones around. I went with the GYTR because it is from Yamaha and I wanted something that was suspossed to not be really loud but would still offer a performance gain.
I was afraid the HMF would be too loud for where I ride.
I have heard a lot of people that really like the HMF but I have heard it is pretty loud.
No I dont think the gytr is too loud, I have actually jumped several deer when riding the creeks with it installed and even the cows dont find it terribly frightening.
I got mine off ebay from these guys at atv galaxy ....they were great to deal with......as for the jetting yes it came with......but only the jet......it is a 140 wich i find a bit large.....if you really want to tune it you will need a full jet kit....at least that is what i think.........take a extra plug with you.......the sound is great....has a sick rumble to it.....
Im thinking of going with the HMF myself. I paid $40 for a new exhaust cap and removed the spark arrestor. Not sure if it will make that much of a difference though. I know it will be lighter and maybe sound a little louder, but will it give me that much more power than what I have already with the K&N and jet kits? Hmmmm
I dont think that those exhaust caps can really make much of a difference in power as all it does is remove a little resrtiction in the cap and a little weight, whereas the exhaust removes a lot more weight and restriction.