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: Aluminium

Colour: Black 

Full Length: 3.5 in/89mm

Stinger Extension: 2.5in/64mm

Inner Diameter: 0.79in/20.2mm (Fits KS1090 and KS95 and many others with 18 - 20mm external ID exit pipes)