Anyone ever seen dyno tests of mercruiser exhaust manifolds? Or maybe comparisons of stock to aftermarket headers? Just curious what kind of HP gains in buying a $4000 aftermarket exhaust.
Wouldn't that be a great tech article in a perfomance boat mag!
What engine are you talking about?
You'll be able to hear the difference, but from what we have seen any performance advantage is lost in all the other variables(temp, weight, etc.), so you won't have to worry about buying a high pitch prop or anything.
Exhaust upgrades seem to work best as part of a balanced performance upgrade.
Like I said it would be great to see a product comparision!