Are there any performance benefites to adding the msd marine box to the HP 500? Will it help with cleaning up the transom, getting rid of the black soot. Has anybody had any good, bad experiences with it. Thanks

Yes I've used them on alot of 500 EFI for awhile .it will help clean the transom and add some rpm's ,use a 6al box and a e type coil they make .

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Any other comments good or bad. Is it work the money or should I just leave it alone. I would think it would help out fuel economy a little and clean up the transom.