I fitted a stainless from the front down pipe back,
even the guy that fitted it said leave the manifold and down pipe well alone. Very pleased with results.
David Vizzard rates the standard RS manifold and thats good enough for me. I would not pay for a Grp 1 manifold over the standard RS as previously said they look identical!
Scottish Air Show at Prestwick at the weekend had the Vulcan and both Lancs plus 2 Spitfires all flew and were also static for the display. To see them all fly was simply awesome, enough said.