go twin 45s with other mods you will see are 155bhp and they sound very good and they are bolt on fitment where the bike carbs maybe a bit more work but maybe better for a faster revving engine but to get the most you really need the other work done

problem is the skys the limit and my view is the bhp gain to the cost of getting it dose not add up on the pinto as I looked into this and went to a different engine although I am running a pinto for now