[b-man]

From what I’ve read the RA manifolds are good for around 8 to 10 horsepower at the most over the logs on near stock applications.

Not much bang for the buck when you consider the cost to do the changeover.

The biggest gain is from freeing up the exhaust by going to the 2-1/2” mandrel bent system and good mufflers, probably gaining 25 hp over the restrictive 2-1/4” crush bent exhaust.