Excuse my last post, I am trying to figure out how to participate on this BB.
I hope this may help some of you having trouble with GT40 exhaust.
I have GT40 exhaust available. My system was tooled from an original, un-altered Mark I system from a JW Automotive Engineering era GT40 , the chassis number of which I am not at public liberty to disclose.
My highly accurate reproduction system was then very slightly tweaked to fit the ERA GT (built by ERA Replica Automobiles in Hartford, CT). The system will fit any 289/302 cu. in. Ford V-8 with stock, Ford Motorsport, or aftertmarket cast or aluminum heads. The system will fit any ERA GT, and has also been used on Safir Mark V's, original (FAV or JW) GT40's, and GTD cars. I cannot confirm or guarantee that my system will fit any other replica or kit GT40's, it is entirley dependant on the engine mounting system used and the configuration of the chassis.
I would be happy to email photos, prices, and options information to anyone who requests. My system is currently available for immediate shipment.
Regards and Good Luck with this George guy...