I went riding with Batman1 last week and he has the HMF dual high-mounts. Once he heard my system, he was sorta bummed/ or maybe better said - Impressed. Lots of people will tell you different things, about brand A,B,C...but honestly its all up to you.
Im running the New Style Micron full exhaust...made 171 rwhp before cams, and the sounds is quite a bit deeper than the HMF's. I would say the HMF's are more dirty/ raspy sounding where the Micron sounds much deeper. Yah, I was shocked myself to hear them side by side.
Micron sounds very close to the Brock pipe, but I would say the Micron is a littledeeper at idle, but a little more raspy at 4k. Another thing to consider is what the pipe sounds like at High RPM's. My pipe is so frickin loud my ears ring/ hurt even with hearing protection when Im in the 10K range.
I can have my Ipod on full volume with the ear-buds that go in the canal, and the Micron will drown out the music at High rpm's. At night, in the city, on a quiet night, the girlfriend can hear me leave and drive a few miles into the distance if I get on the hwy and crack the R's a bit - but I have heard louder pipes, just not as nice sounding at idle.
Oh, and before any one decides to bash Micron for poor performance, do your research...in 2002/03 Micron changed their headder diam, and mid pipe, and exhaust size...might impress you if you actually gave it a try...but I like it because it always seems to impress the heck out of fellow riders for sound, and always shocks the Dyno guys when the numbers become reality....no b.s. but not cheap. Micron is sorta a hidden jewel in the vast field of exhaust choices...and their slip-on's are also nice, but I dont think much of a performance gain.
Im not trying to sell you anything, so take my input for what it is...just some friendly advice.
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