i found an air filter and a muffler on ebay and it says they will increase hp. can someone tell me if this is true and are they worth bidding on. heres the links.

AIR FILTER: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1818914558

MUFFLER: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1818797181

The MAF adapter and cone filter set is priced reasonably, but it's nothing special. They're on eBay all the time. Four horsepower is a stretch, so I'd just pull the stock intake silencer tube and the fender resonator and makes some noise. You won't get any noticeable power without going all the way to a CAI setup.

The muffler is completely bogus. They're selling a one-size-fits-all piece and claiming it will bring you 12-20hp. No way. You can do better.