Originally Posted by dfixit1

I have herd of that and similar, back at it's worst I covered the lt. pipe with an old pair old shop jeans, wasn't afraid of fire cause that pipe never got that hot to begin with, also the outflow on that side was pitiful. I had never noticed the difference in out flow or had that problem hence never had to start checking in to this issue. origanally had the dealer install D&D cutoffs before I picked up the bike new, no issues then when , after several years and I wanted to change pipes I had installed the OE I had kept stored, now that my friend was back pressure on both sides. Felt like my old 3hp Little Indian mini bike I had when I was 10 years old. and kept them on after boring out the innereds, I had my power and sound back. During the year of upgrades and replacing old worn parts I did get new mufflers, cheap but looked good and very lightly baffeled, The Pop issue started only after the cam install, I think the OE cams were around ..485 lift and the RS511's are .510 lift I'll try to get a pic from up the tail pipe, had one but can't find it as of last night. I looked over the "Myths" and was not concerned with anything but the aggrivating noise. with the addition of my rendition of a commerically sold product only to the left side, It stopped the problem and since the most of the exhaust was flowing out the rt. side, well what little if any restriction there may be on the left side is nill and I can't tell any difference in power. In theory it only/mostly does 99% or better stops the air return back up that left side and gauging by just holding my hand at that pipe, No fancy meters or test equipment seems to have the same amount of air flow out. I'm new to this tuning business and noticed that while running the program the rear cylinder was not registering any movement at all and that concerned me a wee bit. After installing the "Device" and running it the AFR in the program finally registered, it was like magic. it started registering and was hitting the MAP target. There must have been so much air being sucked in it was screwing with the 02 sensor on the rear cylinder. I am real happy with the tuner, sound, power and numbers for now. Amazing what a 1.00 part, modified part did to correct those issues. I'll get a pic today and post it a bit later on.