H-Pipe opinions please>>>

[Burt4x4]

I know we have talked about this before but I just need to hear all you alls thoughts before tomorrow.
I take my 72 into the exhaust shop tomorrow to have new pipes installed for my new 454 w/thorleys.

H-pipe Yes or No??
Being a 4x4 the H will have to be placed behind the Xfer case & crossmembers.
Is this too far back to do any good?
Can anyone honestly say they felt/heard any difference after adding a H-pipe?
The place I am taking it too has been in biz fer a LOoong time and I am working with the owner. I will seek his opinion on the matter too I just wanted to hear some real world chatter on this one.
Pls post up if you can. I will be off-line @ 3pmPST today and in the shop first thing tomorrow morning