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pbviking

Dr D Exhaust 07 yz450

10 posts in this topic

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.

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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....

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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?

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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.

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

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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

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

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