Dr D Exhaust 07 yz450

Anyone know the db level on a SS DR D exhaust? What if you add a quite core? I need to get the bike down to 96db. Thank you for your help

DRD states that their pipes, freshly packed, will pass AMA sound tests at 96db.

Yes, that's from their site, and refers to the pipe with no inserts. But passing AT 96 with fresh packing does leave a little room for variances, which could work against you.

I tried to pass 96 at a WORCS race with a newly packed dr d on my YZ450f. Had to put the quiet core in to pass.. The sound test was done by the forest service not the usual FMF guy. I blew 99 without it! Don't know how accurate the forest service guys are though....

I tried to pass 96 at a WORCS race with a newly packed dr d on my YZ450f. Had to put the quiet core in to pass.. The sound test was done by the forest service not the usual FMF guy. I blew 99 without it! Don't know how accurate the forest service guys are though....

Ouch

That is what I am afraid of. Did you notice any difference with the quiet core in vs out. Power, sounds, or?

I tried to pass 96 at a WORCS race with a newly packed dr d on my YZ450f. Had to put the quiet core in to pass.. The sound test was done by the forest service not the usual FMF guy. I blew 99 without it! Don't know how accurate the forest service guys are though....

yeah, no way to pass with freshly packed muffler. I heard if you cut out the airbox in certain areas it will help. I had a pro friend that got stuck running a stock silencer once, due to him not passing sound check.

better safe then sorry get, i would get the insert just to be sure you will pass the test

better safe then sorry get, i would get the insert just to be sure you will pass the test

true but i am hearing that with the insert the bike is still very loud 97-98 dbs...

At least that is how I read into the dr d system

there is a full system on ebay now that has the quiet core included with the auction

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now