If your looking for 95db then just keep the stock pipe. If any pipe is restricted that much it WONT make power. The only disc system I've seen that makes power and is resonably quiet is the CT Racing exhaust.

The end cap is definately tuned with the reverse cone and comes with a completely detailed jetting instruction sheet. You 3 inch opening probably works fine but personally I think its too big.

 

that exactly right, i had the wifes ds set up with gearing, and clutch springs, and she would put it to plenty of piped ds's, won't bring up where the raptors were.