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-   -   K&N Flame Arrestor for 7.4MPI (https://www.offshoreonly.com/forums/general-q/31749-k-n-flame-arrestor-7-4mpi.html)

crmax 08-28-2002 04:32 PM

mine didnt come with the cover the forgot at the factory to put it on, I like it off anyhow. I got mine from rexmarine

crmax 08-28-2002 04:34 PM

and Ive seen the k&n on with the cover so yes it should fit back on

dloftis 08-29-2002 01:28 PM

Well, including uncoverring the boat, opening the hatch, pulling the over off, swapping the flame arrestor, reinstalling the cover, closing the hatch, and covering the boat... it took about 10 minutes.

Much easier than I anticipated.

Thanks for the input.

pstorti 08-29-2002 02:02 PM

I also have a 7.4 MPI in my boat did any of you guys notice or see (on gps) any performance increase???

dloftis 08-29-2002 02:15 PM

pstorti,

I haven't tried yet... although I'm at the limiter with the stock filter. I'm changing to a 24p Bravo I from a 23p Mirage Plus this weekend... So I won't REALLY know. But just by looking at the thing, the engine is going to breath easier.

turbo2256 08-29-2002 02:15 PM

Oh yea the gasket behind the throttle body protrudes into the port I trimmed that out to. Performance gains unknown at this time because I havent gotten a prop on it yet that dosent smack the rpm limiter but midrange cruse seems better

crmax 08-29-2002 09:39 PM

I put the k&n on at the same time I put the thru hull exhaust on my mph went from 58 to 61.5 both were gps readings

Rick252 08-30-2002 04:57 AM

dloftis
 

Originally posted by dloftis
Rick,

I got the flame arrestor from Martel Brothers... it's a performance shop in Katy, TX (close to where I work.) They also are one of K&N's bigger on-line sales sites... www.martelbros.com. It is the marine certified, race/off-road use only, flame arrestor. (Part 59-5004)

Which engine do you have. They gave me a different P/N

dloftis 08-30-2002 07:15 AM

Rick,

I've got a Mercruiser 7.4MPI 2001 (same as 2000)

Check this web site out:
http://www.knfilters.com/marine/boats.htm
It lists most Mercruiser motors and the appropriate part number.

(BTW: The 59-5004 is correct for my engine... it fit perfectly.)

SeaRay Jim 10-18-2002 11:29 PM

dloftis,

The 59-5004 looks by numbers like it's higher (taller) than the stock arrestor. It shows 6" and although mine's down at Travis from memory that's taller than stock. Did you find that to be the case or is 6" about right?


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