Friend of mine, had the same experience with some Stainless Marine exhaust. Next, however, he did head work and enlarged the carb jets, and saw BIG GAINS.
Seems like stock is ok with stock. If you want more just doing one end of the motor or the other isn't going to change with equation much without changing fuel in, head work AND exhaust.
Just another boater, who hasn't cut loose with the bills for new exhaust....
Originally posted by boatnam2:
i think on a hp 500 and above you would see good results.but the guy who bought my 21ft ultra 350 mag put on powerflows and seen no gain.