My SP1 with titanium race cans and BMC race filters thats was bl**dy loud,
my old Honda CBX with 6 into 2 moto martin pipes sounded like an F1 car on a hot lap
Couple of others (yeah i know the're cars but !!! Honda Vtec with race exhaust when it hits the vtec zone O-M-G if ever a car sounded like a bike !!
Lamborghini or Ferrari V12
My new gixer thou doesn't need a loud pipe the induction roar coming from under the tank every time you give it a fistfull is intoxicating,