EMI Thunder Exhaust....
 

Hi everyone,

I'm new to the site and look forward to reading several posts from the many who give great opinions on this forum.

A question to begin with. I have a '08 Formula 292 Fastech w/ twin 6.2 Merc's. I took off the stock cast iron manifolds from the factory and installed a pair of EMI Thunder exhaust kits. By installing the EMI's I know I reduced close to 75-100 pounds in weight per motor. But what I really want to know is, am I at all reducing the peak performance of the boat vs. the stock cast iron manifold set up?

Some numbers: 24 hours on motors, WOT RPM is 5000, WOT GPS speed is 70, and 28 labbed props tweaked a little from Mercury Racing.

Any comments would help. Thanks in advance.

Sounds like it is running well with thst setup.
Bob

Heres some data on those manifolds. EMI and Revolution arre identical.

http://revolutionmarine.com/images/manifolds5.PDF

Kirk

This site compares Rev's to stock manifolds.

http://www.c-techperformance.com/dow...comparison.pdf

I believe you did the right thing. Removed unneeded weight and added a better flowing exhaust that has proven reliable. While it by itself will not provide a huge speed increase, its a solid foundation for future mods.

Thanks for all the feedback. Glad to know I'm headed in the right direction.