Fuel and clutching mods are not necessary prior to installation. GGB two stroke mufflers are flow benched developed for back pressure against the stock muffler and will perform efficiently in any application where the stock muffler would be used. GGB Mountain mufflers are designed to be used in areas where increased sound levels are not an issue. These cans are loud when you open the throttle.
Sound level increase over stock (dbA) Idle + 4-6 / Under load + 10-18.