well. buy the Y pipe. measure it. take out the old cat, and measure it, the difference is what you will need. the only actual way to do it is to cut it out and fit it in. we all have cut our downtubes at different lengths, so each one is going to be a unique length. don't the 94 have a resonator on there also? take that out, more pipe is needed. here is how i deleted my crap:
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