I have bm twins on mine. I believe the chip completly remaps the fuel. Bought mine used and i ran it for a while with the stock chip, it was very boggy on the bottom end before I figured out I had the wrong chip. Now it rips
Mine is an efi. The guy i bought it from must have put the stock chip in when he sold it. It idled fine
and after 7000 rpm it was ok but everything inbetween sucked. I put the correct chip from bm and it fixed everything. Never had the stock pipe on
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