jmp pipe question
 

Okay everyone, here's another strange question...will a JMP tuned pipe work properly without that dome-shaped covering at the back end?
I have an OS.91 and JMP pipe in my Y/A F-4, and when I landed, the rear end of the pipe had blown off.
Thing is, the engine seems to work just fine without it!
Anyone ever heard of this happening? :confused:
Do I need to get a new pipe?
Thanks,
Lee.