best performance exhaust for 496 engines?
 

thinking of upgradeing exhaust system on my twin 496 ho boat . what system performs the best , most hp gain etc. don't have alot of room between engines so need to take this into consideration.

most people run the corsa or CMI exhaust when upgrading.

Check out Kieth Eickerts. I ran them on me 242 and they were a great exhaust! Here is a comparision of various exhausts on an HP 500. Click the arrows on the top to scroll through the data.

What are you trying to accomplish?

trying to get alittle more top end speed , figure with exhaust , and prop change it would be possible?

Take the KE manifolds and skip on the CMI headers. That way you will gain good performance if you upgrade your motor, and you won't have leaky CMI headers. For what it's worth though, it has been debated over and over. But fact is, that new headers or manifolds won't help you alone. I don't care much for it when BT says 4-5+ mph gain, I don't buy it. I know of no one who saw a speed increase over 1 mph from CMI's or other headers. But of course, when CMI pays for advertisment, you better reccomend it when you are the lead test driver.

What are the spec's on your engine. How many RPM's does your engine rev at max power?

Agree 100% with this statement. CMI will only last so long and then they will leak. The KE's will last much longer than any tude header and you'll never have to worry about leaks!

put a different intake on first...

One with a blower attached?? :lolhit: