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Hi,

No you cant use a non magnum on a magnum sorry. The magnum will be a little quieter than the non magnum, similar to adding an extra baffle to a non magnum.

Thanks

You will have to buy the whole magnum rear chamber for $255, or if the one you have is brand new you can send the rear chamber back to us and we can swap it for the magnum one, you will have to pay...