i have removed 2 from mine the silly thing is i wanted to wait till i had a spare set for test in case then relised i was stupid so i just did giving me a year to get spares for test.
sound is great took mine out with screwdriver and mallet really quick job as well was surprised how easy it was.
the other reason for only taking 2 out i was advised by the mech at local triumph dealership i wouldnt need to re jet or anything and it running fine
