Replace Stock Exhaust on 496?
 

Has anyone ever replaced the stock exhaust on a 496 Mag or HO? If so, were there any hp/torque gains?

Re: Replace Stock Exhaust on 496?
 

Several boaters have added CMI E-top exhausts to 496 packages. Our dyno says its worth about 20HP at the Crank.
Raylar

Re: Replace Stock Exhaust on 496?
 

Thanks for the info!

Re: Replace Stock Exhaust on 496?
 

Will the standard big block CMI's bolt up to the 496 heads or does CMI make a different header for the 496 head?

Re: Replace Stock Exhaust on 496?
 

Don't waste your money. The exhaust you have is designed for that motor. You will see no performance gains,

Re: Replace Stock Exhaust on 496?
 

I agree with Pure Energy. My $00.02 says that even if you get 20 HP at the crank, the expense is not worth gain unless your old manifolds are/or are about to start leaking. Save the bucks now and make them grow until you can (Upgrade engine, install S/C, Cam, heads, intake and carb/injection improvements.) How many of us installed headers on our old cars and without doing anything else to the engine saw an improvement, other than the "coolness factor, as... I got headers an' you don't". don't get me wrong, on the right engine Hi-Perf exhaust is a MUST.

Re: Replace Stock Exhaust on 496?
 

I'll probably stick with the stock exhaust for a while.