Upgrade to a factory sealed AGM battery

Alternate ride plates

Intake grates

Jet pump exit nozzle wedges
The pump wedge changes the exit force of the water jet, pushing the rear down and lifting the nose higher.
This generally provides better top speed, but can aggravate porpoising on the shorter hulls unless a longer ride plate or trim tabs are in place
Wedges exist in angles from two degrees to eight degrees
Polaris only made 2 aluminum wedges and they were painted black (one is a 4 degree wedge, the other a 'twisted' wedge (which is junk).
All the other factory 4 degree wedges were plastic.
The 2, 3, 5, 6 wedges were sold separately and not painted
3 Degree Wedge Polaris Part# 2900078
(2 and 3 degree wedges may be close to optimal on the short SL hulls)
Six degree wedge sources Polaris OEM PN was 2900077

Note: Some SLX780 and SL900 models (1995-1996?) came with an unusual 'twisted' wedge, angled stator tail cone, and 3/16" longer water tube

Alternate impellers

Alternate and adjustable pump exit nozzles

PWC captive drain plug upgrades
Replace that old drain plug with a better design

How the jet pump works - Into the Pump

Aftermarket hull sponsons, how they work - Beach House