Whats the difference?

[timmmah]

Been looking at these on ebay from the same seller and was wondering what the difference between the two was? Obviously one is twice the price, but performance is what matters!

http://cgi.ebay.co.uk/K-N-57I-GEN-I...ryZ36680QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.co.uk/K-N-57I-INDUC...ryZ36680QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[MT AUDIO]

one is enclosed,the other is open

 

[timmmah]

Any difference in bhp though? Which is best?