I was just wondering, I have really been thinking about buying a FMIC off ebay. I have a extended warranty on my 2003 mazdaspeed and I was just wondering if anything bad might happen if I add one while leaving my turbo at factory setting (6-7 psi). I was also wondering what size would fit best. I was looking at a 28"x7"x2.5" fmic (total length not core size). Do you think that would be good, you can check it out at http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7907065002&category=33742 . Give me some feedback. Thanks.