This extensions are held on to the exhaust stingers via two "jam" bolts that are 60 degree apart. There is no need to drill hole in the exhaust tips. Apply a little red loctite on the two jam bolts and the stingers will stay on. To remove, unbolt when the exhuast is still warm.
We have tested this extensively and are confident of your satisfaction!
Material: Aluminium
Colour: BLACK
Full Length: 4.1in/104mm
Stinger Extension: 3.1in/78mm
Inner Diameter: 0.60in/15.1mm (Fits RE3, RE2, and most MTW canisters or Cans with 14-15mm outlet pipes)