Decibel level of stock EX

[Guy400]

Anyone happen to know the decibel level of a stock EX? I'm trying to draw a reference point as to what I can expect with a new pipe. I'm talking with Kevin from HMF about a pipe with a quiet core insert. They've got two inserts, one a 95db insert and the other is a 92db. So if someone can tell me what their stock EX was rated at I'd appreciate it.

[Doibugu2]

I believe it's 88 if I'm not mistaken.

Let me know how you like the power with the quiet core insert. I don't think my quad is loud now, but some of those exhaust are just way to loud.

[hawiianpwr]

Yeah I think your right its 88db

[wheeltrax]

i think its 88 or so also. The stock raptor is 92, and i know the 400ex is a bit quieter.. so i think that 88 is a good bet.

[Guy400]

Originally posted by Doibugu2
I believe it's 88 if I'm not mistaken.

Let me know how you like the power with the quiet core insert. I don't think my quad is loud now, but some of those exhaust are just way to loud. Thanks for the info! Kevin stated that the 92db insert retains 80% of the power gains over the bare slip-on and the 95db makes 95%. I'm waiting to hear back from Kevin as to what the bare HMF slip-on decibel rating is so I know exactly which way I'm going to go. He also said spark arrestors are free upon request.

[remlapr]

Yeah - post back and let us know what he says the bare db is. I also agree the stock db is 88 - I believe it was in a pipe shootout in one of the big magazines.

[tants]

its deff under 90db's. they sure are pretty quite :eek2:

[JOEX]

http://www.oohva.org/pages/sound.html
Near the bottom there are links to actual readings taken from various atvs during testing. There can be some variances mainly due to age of the packing.

Joe

[Guy400]

Just heard back from HMF. A bare slip-on produces 98db's.

[Porkchop]

spark aresstors are free now!? i thought they costed 20 bucks last time I checked. I'll have to e-mail Kevin then about that and one of those inserts


Guy- you'll love the HMF, are you gonna get it pc'd?

[Guy400]

Originally posted by Porkchop
spark aresstors are free now!? i thought they costed 20 bucks last time I checked. I'll have to e-mail Kevin then about that and one of those inserts


Guy- you'll love the HMF, are you gonna get it pc'd? Kevin told me in an email that the spark arrestors are free when I buy a slip-on and a quiet core insert. My cousin has a bare HMF slip-on on his EX and the low-mid power was night and day. I don't know if I'm getting a PC'd one or not. My only decision I have to make now is what quiet core I want-the 92db or the 95db.

[Silverfox@C&DRacing]

Wow spark arrestors are free now :eek2: Yeah they were$20 extra.. I do know that if you ride in a National forest and the pipe is not USFA stamped then it does not matter if you have a spark arrestor in there or not and the HMF pipes are not stamped.. I know that does not happen ever where I hear that if they stick the stick in there and feel, you pass inspection. Not where we are :rolleyes:

[Guy400]

Originally posted by Silverfox@C&DRacing
Wow spark arrestors are free now :eek2: Yeah they were$20 extra.. I do know that if you ride in a National forest and the pipe is not USFA stamped then it does not matter if you have a spark arrestor in there or not and the HMF pipes are not stamped.. I know that does not happen ever where I hear that if they stick the stick in there and feel, you pass inspection. Not where we are :rolleyes: LMAO:D Half the time around here the park rangers don't even inspect the quads. They did one time and my cousin and I just went to a hardware store in whatever small town we were in and bought some window screen and zip-tied it over the end of the pipe. The ranger said it was now OK and as soon as we got in we obviously took it off.