Hi, I am curious to know if anybody has used the extrude hone process on their exhaust and / or intake manifolds? If so was there much of an improvement over the stock/reproduction castings. I am thinking of getting a pair of reproduction exhaust manifolds done to maintain a stock appearance and pick up a few extra horses along the way. Also considering either my stock 4bl or Shelby high rise intake( repro ) and ceramic coated as well to reduce heat.
Thanks Eddie