View Full Version : Aftermarket Exhaust Manifolds
CBLavey
03-24-2004, 08:24 PM
I'm thinking about upgrading the exhaust system on my 6.2MX Mercruiser. There are so many choices - Eddie Marine, IMCO, Gil,Dana, CMI, Lightning, and more so I'm looking for some input based on anyones personal experience with a system that they have used. Real world horsepower, speed gains, etc would be appreciated!:cool: :cool: :cool:
summerlove
03-25-2004, 02:52 PM
I picked up 800 rpm and about 6-7 mph by adding thru-hull exhaust and switching over from stock merc exhaust to IMCO Powerflows. Boat is about 3500 lbs - 4000 lbs and is running a 330 HP 454.
Hope it helps.
carreraboat
03-28-2004, 09:13 AM
I have a freind that is selling a set they are like new he going with big block power and wants to unload them
unless your going from through hub to through transom don't waste the money. If it is part of other added features the go with the lighting headers. I heard the Dana products are good also.
CBLavey
03-28-2004, 11:20 AM
Thanks for the info. I'already have through transom exhaust. I'm swinging a 22" Bravo Four at 5200RPM with a moderate load - full fuel, four adults, gear. I think that a good exhaust system will allow me to swing a 23" - 24" pitch at the same RPM.:cool: :cool:
CBLavey
03-28-2004, 11:22 AM
Originally posted by carreraboat
I have a freind that is selling a set they are like new he going with big block power and wants to unload them
Thanks for the offer, but I think I'd rather buy new for the sake of a warranty.:cool:
Havasu Hangin'
03-28-2004, 11:23 AM
I think the aftermarket manifolds (like EMI or Imco) are good up to 500HP. After that, I'd consider headers.
Trash
03-28-2004, 10:08 PM
I'm not sure you're going to see any advantage using aftermarket exhaust manifolds, except perhaps, a lighter wallet. Seeing as how you have through-hull exhaust, your engine is going to breath about as freely as it can in this stock configuration.
I'd try a bigger wheel just for kicks and see what happens. It's a heck of a lot easier that swapping out manifolds.
Desert Rat
03-31-2004, 03:40 PM
Originally posted by carreraboat
I have a freind that is selling a set they are like new he going with big block power and wants to unload them
Whats he asking for them?
carreraboat
03-31-2004, 03:58 PM
i will ask
flat broke
03-31-2004, 05:04 PM
I thought I remembed seeing a set online that looked like Gil units, and after doing a little digging, I found em.
http://revolutionmarine.com/images/manifolds5.PDF
No decent data on them, but at least they have dry riser joints and individual runners. And at $995 not a bad deal even if doing a rusted merc swap out.
Chris
gnarley
04-01-2004, 03:42 PM
Originally posted by flat broke
I thought I remembed seeing a set online that looked like Gil units, and after doing a little digging, I found em.
http://revolutionmarine.com/images/manifolds5.PDF
No decent data on them, but at least they have dry riser joints and individual runners. And at $995 not a bad deal even if doing a rusted merc swap out.
Chris
I read about these also and wonder how they flow as compared to other more expensive choices???
carreraboat
04-06-2004, 03:29 PM
hey desert rat left you a pm
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