i was wondering how much louder than stock the HMF full system is with the spark arrestor and the quiet core on. i need to get a quieter pipe because of complaints. thanks a bunch

 

i think with the spark arestor and quiet core its quiter than stock. they claim 92db with just the quiet core. i think a stock 400ex is right around 92 also, im not very sure on that though.

 

the 92-95db claims are on the smaller bikes like the 250's I run an hmf with the so called quiet core... while it is much quieter with it, than wothout it.. it still is quite loud.. im guessing in the hi90's low 100's

 

my hmf is 98 dbs

 

an HMF with a quiet core is still very loud, but it loses a lot of power and throttle response.

 

is there any pipe out there that got good power and is quieter than that? because where i ride i need a pretty quiet pipe. stock is jsut not enough juice for me and it can be louder