http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33631&item=2435204525

are they the pre-cats? anything wrong with those? cause i'm planning to get those to replace my bad cats?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33631&item=2435187868

and this one looks like a good deal to me. can i replace one side and leave the other side alone?

many thanks
eric