On FRPP's online store it looks like they have a new spark plug for the 08 and newer motors. Does this mean we can use spark plugs that don't cost $10 a pop? More importantly, can the new heads be retrofitted to 05-07 motors? Whipple also seems to advertise another 50hp for the 08-08 models. Did anything change in the head design or is this due to being able to use better spark plugs? I know this has been discussed before but my search didn't produce anything relevant. Thanks for any input.