DRI 4-Stroke Bolt-on Kits are designed to provide the maximum horsepower increase while preserving reliability

Product Information:

S-1 Kit  #BK4-3350  $595.00 
Includes: Complete Fat Boy 4 Exhaust System (with STD Muffler), Jet Kit, Pro Flow Air Cleaner Kit (Flange, Uni Foam Filter and Foam wrap)
Power Gains: 15-20% gain in HP
Excellent Start Up Performance Mods. Stage 1 Power

S-2 Kit #BK4-3250-VHP -(DISCONTINUED)
Includes: S-1 Bolt on Kit , Complete Fat Boy 4 Exhaust System (with STD Muffler), Jet Kit, Pro Flow Air Cleaner Kit (Flange, Uni Foam Filter and Foam wrap)& Vortex X10 CDI Kits are designed to work with most DRI engine kits