I have one and love it! I talked to John from J&S the other day and you buy them direct from J&S. Tell him your from the forum and you talked to Richard and he should give you a discount, not much of one, but still a discount is a discount. Tell him you want it for the original group buy price.
you will need:
1004-1CH/2CH1 Ch/2 Ch knock retard and boost retard Honda, Miata, MR2, Subaru, Eclipse, RX7
Specify application when ordering : tell them you have an MSP
$495.00 (can't use Protege factory sensor)
BSKBosch Knock Sensor kit$75.00 (shielded cable, adapter bolt and connector)