Want Mid 70mph Speeds on your docile F-15X watercraft?  You have come to the right place!  This kit is no joke! and is to be used by experienced Personal Watercraft riders ONLY

We recommend installing the ECU with the MACSBOOST 15 series intercooler.  The I/C keeps intake temperatures down for the ultimate in sustained performance and gets the most from your ECU investment.  Horsepower is bumped up a modest 75 ponies at the prop!

There is no stock boat on the water that can compete with your MACSBOOST F-15X Stage II.

Updated tunes are available on our forums here.  You must be an existing customer to be given access to this area of our forums.

  GPS comparison graphs are available on our forums for a stage 1 F-15X. macsdomains.com/forums/viewtopic.php  We will try to post some recent Stage II data soon.