Well tpaul welcome to the site, as far as a pipe I dont have one myself so really could not help you on that one.
For the K&N filter there is alot of mixed feelings on here wether or not they are good or not. As far as I go I have the K&N but I also run with the Pro Flow Flange. From what I hear just the K&N replacement filter for you stock one is junk, the gasket keeps ripping and in some cases gets sucked into the intake.
i put a Dubach muffler (Dr. D) on my bike,and i love it,,,it gives it a deep throaty sound,,,not rappy,or irritating,,,,it is however louder than stock,and there is a gain in HP,,,,its very well made,and was easy to install
a little advice,which ever pipe you end up with,,,,go to the auto parts store,and get a 1 1/4 exaust clamp,,,and go to Lowes (or like) and get 3 large hose clamps,about the same size as you use on the back of your Cloths drier,,,you will need the hose clamps new when installing the new pipe with the stock heat shields,,,and the exaust clamp,because the stock one wont work with the new muffler
this will save you a trip to round these things up once you start the work
one bracket is spot welded to the stock muffler,,,you will need to use a cold chisle to remove it,and grind the spot weld off to reuse it,or order new from Yamaha (i reused)
also i too use the K&N air filter,pro flange,and outerwears,,,,,to me,there is no way dirt can get through,as long as you maintain it clean,but cleaning goes for all filters,,,,its the flange setup that is impressive
Yes Noel, it will be too loud, I would suggest you take the end off the exhaust and take a very long 12mm drill bit (about 30cm long). Now remove the spark arrestor and what you have inside is a baffle wall. Drill 4 holes evenly spaced around, through both front and rear baffles (this is why you need the long bit). Put it together and try it out.
The maximum holes is 12. the more holes the more noise.
Also for normal riding pu on the 2" power tip, for hunting put on the origional one (it is quieter)
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