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 exhust is still warm.
We have tested this extensively and are confident of your satisfaction!
Material: Aluminum
Colour: Black or Silver
Full Length: 4.1in/104mm
Stinger Extension: 3.1in/78mm
Inner Diameter: 0.60in/15.1mm (Fits RE3, RE2, and most MTW canisters)
 
Note: These products are in stock in US warehouse now, you can choose US warehouse shipping.