Hi-Po exhaust

I've been reading the post on the exhaust and would really like to have the Hi-Po single exhaust on my 65 Formula S. The car has duals that are homemade. The right side has a curve that goes under the cross member. Also with the rear valance is cut to accept the resonator on the left side and it would look better.
My question is have any of you purchased the systems that are avaliable and are you happy with the product and service?
I really don't know why it cost so much and wish there were a cheaper way, but if you want it done right I guess you just have to put out the $895 or whatever.
Thanks for your feedback