I believe the ones with screws in them are Super Tigre pipes. I have one on my recently completed and maidened Dirty Birdy. I've loaded a picture that shows the pipe. Performance wise, I got 14,200 on an APC 11X7 on an OS FSR 61. That was with the MAC header cut as noted on their website and no further tuning since it seems to get on the pipe well and the needle isn't critical. After the picture was taken, I chucked it in a lathe and polished it with fine emery cloth. It really made it look much better with very little time spent. I hope this helps.


Chuck