Simple to mount onto the existing chimney the racer can drill and tap or drill thru and install nuts and bolts to mount.
Chimney extension measures 4.750" overall, from chimney diverter mating surface to top of chimney extension 4.00". Extension is 5.50" x 2.625" wide at the top of the chimney and weights one pound. Chimney is made from one solid piece of billet alum. to provide strength and to get the boost out into the atmosphere.