Review on PTNHZ Universal Aluminum V Band Flange by Shahed Cleveland

I used this on my 08 535xi. I installed a new JB4 upgrade charge tube. The N54 is supposed to have an 11lb exhaust valve, so I just used an 18lb spring and cut off the extra coils. This is an evenly wound spring so changing the spring rate is very easy. I think it was a 9 coil spring so just cut 3.5 coils off it. I've driven the BOF for about 2000 miles and it has worked flawlessly so far.