no actually everything I read said I should jet down 2 sizes because of restricted air after adding it (even hetrick said that) but after mucking around with jets about 5 sizes in both directions I called drr and they said that everyone including hetrick does not give it enough credit and I should jet way up as it actually increases velocity. so I did, I jetted way up and it ran mint! I don't remember the exact range I was in and what I went to but it was like an 80 main to like a 128 or something.