exhaust help??

[honda400ex01aca]

hey i just notice my fmf slip on didnt fit my head pipe do i need to buy a aftermarket head pipe or is there another way to fix it??

[sideways]

my fmf slip on came with a reducer to fit it to the stock head pipe. i believe the slip on is made to fit the fmf powerbomb hedder, which has a larger diameter. problem with the reducer is it doesnt fit tight over the stock hedder, leaving a 1/16 in gap for a nice (and hard to fix) exhaust leak.