I am not knocking the guy, he has every right to put together a package to sell and make a buck, but it is our responsibility to be wise when looking to buy something.
The parts in his package can be found for less but then there is the time involved to search and get the items from several sources. The muffler can be purchased from Jireh Cycles for $36.95, the Filter is $10 from Speedmoto I believe, the jets and screws and washers about $10. Throw in shipping to get them all together and it all totals about $75. Then ebay and Paypal take another 7-8%. So his profit at the end of it all is about 20% net.
The disc he has ( I purchased one just to see what was in it ) contains a lot of stuff from this site directly &/or indirectly, plus an assortment of other stuff. Is it worth it ? ? While interesting, it lacks hard core tech info. I think the disc for sale here is much more useful and practical.
The main thing he is selling is convenience for the buyer...getting it all from one source.
Anyway, the point is that his package is a fair deal for what you get.
It all depends on what you want, the time you have to surf the net, and your tech knowledge base. Better parts prices can be found but it takes some time to do it yourself.
Of course, personally, I like the packages I have available ...