For sure the originals were much better, tuned more as well. Every model after them had varying methods of restrictions. Some had missing boost bottles, reed switches in the clocks, powervalve cables the wrong way round. One year even has a CDI so restrictive it retards the powervalve at something silly like 8500rpm. And then there were the baffles and sound insulation in the expansion pipes!
More work involved in getting rid of all that lot