I don't know the specifics with that exhaust mod, but I would turn the screws CAREFULLY all the way in and the start at two and a half turns out. This is the general guidelines the brains on this sight would suggest. I ended up with 3 turns on the front and 2.5 on the rear cylinder. This is a few threads on this kind of problem already. I would search for them and read them. FYI the screw for the front cylinder is on the left and rear on the right. It took me a while to realize this. Hope this helps.