I repacked my werkes exhaust today too!!! it was pretty straight forward. drill out the top rivets, pull apart, pack, reassemble with rivet gun.. it took all of 45 minutes and WOWWW it made such a huge difference!! when i pulled mine apart it had no packing whatsoever. no wonder this thing was so loud. I used FMF 4 stroke cuttable repacking pad from my local dealer. it was $32. just roll it as tight around the core as you can and slip the can back on. super tight fit.. Ill try to post up a sound vid, but i promise it made a huge difference. it sounds exactly like a 450 dirtbike now, only meaner. no obnoxiously loud idle anymore. purrs like a kitten until you hit the throttle and it lets out an amazing sound. it also pops on downrevs now which sounds badass lol im running pcv, air box mod, and k&n btw.. DO IT YOU WONT REGRET IT!!!
Also, I rode about 3 hours today in the mountains and was constantly on the gas. still sounds the exact same as it did when i left. hopefully it lasts me a long time!
Try a finer layer of steel screen / mesh wrapped around the core, here is a sample of a dirt bike piece.
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Doing some research online, came across this which could be an option:
https://www.bristolcore.com/Bristol_Core_Wrap_p/14289.htm
https://www.bristolcore.com/Spec_31_HD_Kit_15_p/14287.htm
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Trae, assuming it's still working well for you, can you confirm exactly which FMF 4-stroke packing you used?
They show 3 variants here: Products - MX - FMF Racing
The $22 price you referenced in another comment corresponds to part number 015302, 'pillow'.
There's a $27 'race packing', part number 015303.
A third cheaper $9.99 option which I assume is not the one you're using... 010590.
Any news on the development of a package? I wonder if it will allow my bike to run at Laguna Seca with their sound restrictions.Good news, I got in touch with Morgan Curtice at Bristol Core yesterday and he'll be sending me a sample of their latest Spec 19 fill and the Core Wrap to test out. I'll be sending them the specs on the pipe so they can advise on appropriate amount of fill. He's optimistic that their product will work very well in the Competition Werkes pipe and it's exactly the type of project they get interested in. He expects their materials should provide much longer repack times based on their extensive experience in this domain.
They will also entertain a group buy discount on the resultant package they'll put together for this pipe so before anyone else thinks about selling their current pipe, give this a whirl first.
My pipe just came back from Competition Werkes with fresh factory repack, new badge and center coated. I was hoping to get it out this week but with this latest dump of snow, it may be a couple of weeks yet.
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Any news on the development of a package? I wonder if it will allow my bike to run at Laguna Seca with their sound restrictions.
Check out the timing values that DynoJet uses for this exhaust (You can download their map on their website). They don't use an open air box on any of their maps right now so I wouldn't use their fuel values but you might want to copy their timing advance for the Werkes pipe since it has up to 6 degrees advance (their other maps go up to 4 degrees).
Yes, parallels works just fine with the dynojet software
Check out the timing values that DynoJet uses for this exhaust (You can download their map on their website). They don't use an open air box on any of their maps right now so I wouldn't use their fuel values but you might want to copy their timing advance for the Werkes pipe since it has up to 6 degrees advance (their other maps go up to 4 degrees).
Maybe Ben's an authorized DynoJet tuner (You can look up his company on DynoJet's website) since he's using the same timing spec.s. Tough to say if it's safe for your bike, elevation, gas quality, weight, and mods but it's definitely encouraging that DynoJet felt 6 degrees advance was worth doing with the Werke's pipe.