Modified exhaust

[Transtech]

Any one on this site have a a late 80's Malibu skier with the 5.7 and what exhaust modifications have you done to get that thump sound out of the motor

[Michigan boarder]

What are the details of your current system?

[Woodski]

Can you give more description on the sound that bothers you?  One contributor to a thumping sound is water pulsing in the rubber hoses.  A way to reduce that is to eliminate as much rubber hose as possible, you do need flexible connections between the hard attachments.