Ok, I need someone to convince me wether or not to invest in a PMA. Do they work on all years ( my boyfriend is building me an 81 ) is it an easy install and are there other modifications he would have to make. He is busting his can to get this bike done before the end of the riding season and we have about $500 in parts so far, so if his isn't an absolute must have we've thought about saving it for the winter to do list! It is quite an expensive upgrade ( if my memory serves me around $300 ) and we just don't know enough about it to justify one way or the other.