Pay no attention to Andy's '28 witch hunt, on a normal 250 there's little to choose betwen a spliced PGMIII and an 030 carded PGMIV. Both will make low 60's bhp, the problem is on a '28 you need the 030 card, on a '21 you need a soldering iron. Actually you also need the soldering iron on the '28 too.
But as you have to HRC card already this is a moot point.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread