This is a plug and play item, no modifications required. TIG welded for smoother internals, reduced internal turbulence = increases performance. After removing the original exhaust pipe, connect the middle link pipe to the motorcycle, connect the exhaust pipe to the middle pipe, and fix it for normal use. Please note that the inner diameter of the exhaust pipe need approximately 50.8 mm. Easy to install, No Installation Instruction We will give you a sticker as a gift after you submit your order.