expert opinions please....

[EB847]

1. is "dansk" the oem supplier to porsche? what is the quality of this item versus the oem porsche sport exhaust for much more $?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=003&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=130191327325&rd=1

2. "hallowing out" the stock muffler.. level of diffuculty? cost to have done? results from any who have done this?

3. any cel problems with either of the two above mods?

4. any other aftermarket exhaust recommendations under 1k?

thanks for any advice..