SeaDoo GTI 90HP Performance Tune License + Self-Install Rental KitJetX tunes for the SeaDoo GTI 90 H. P. model performance tune is backed by Jet X Powersports, one of the best watercraft performance shops in Canada. This tune will provide a boost of performance without requiring extra parts or mechanical knowledge. This tune will not compromise reliability and once installed you will experience the following: An increase in acceleration and throttle response Raised (but safe) RPM limit Touring and Sport modes remain