It WILL be loud!, I said IT WILL BE LOUD! However, just have a look up the rear silencer and see if it has the baffles reducing down to smaller than the 3" bore of the rest of the exhaust. If it has, then it won't be suitable for above 350bhp. However, I am led to believe that following this criticism of their system that they have switched to a 3" baffle like the Mongoose / Blue Flame, but I have not seen one recently to confirm this, so I can only say what I know .