I have a used fmf gold series and flange but the flange is not the normal fmf flange it has like another inside wall and the flange fits around pipe not in the hole is this correct ? It has a spring mount and is there anything other then the spring i should put on ? The fmf is only for the mean time as my baffling broke inside and messes with the quad, my question is should i rig this fmf up to stock sliencer and will this flange work or should i just up grade