ive got a scorpion did have a mongoose on the 1900 got to say the scorpion way out performs the goose in sound and performance i see a 15% rise in the rev range thru out we also did back to back testing with a std item the scorp showed a general increase of 65 bhp and 90 ft lbs or talk

goose 3 " with 5" hks drager slash cut grafted on for me next 1