Hi, I hope somebody can give me some answers as to tuned pipe length for a stock 260 PUM in a 56" Apache. (Ex. port to weld) I know this length will vary, but where should I start and how will I know which way to go shorter or longer? And with motor mods will the pipe be longer or shorter?
What do you guys think of the Cooper QHP pipe? would it be a good choice for my boat?
Thanks, John