Is that just an extension for your stock exhaust? if not, you will imbalance the back pressure on your exhaust and this in turn may damage your engine
Secondly, when off-roading on dirt jumps etc. The exhaust hanging on the suspension arm will definately become loose, and fly around not only this the fumes/excess fuel coming out of the pipe will corrode the suspension arm over time
sorry to spoil your time and work but are you willing to take the risks?