exhausts for 496 engines ?
 

cmi has a system for the 496 engines claiming 50+ hp for $3600, is there any other exhaust systems putting out same hp for less money ?

Re: exhausts for 496 engines ?
 

Here is an interesting link you might want to check out.
496 exhaust

Re: exhausts for 496 engines ?
 

CMI is the only company that has released dyno sheets to date. ;)

Re: exhausts for 496 engines ?
 

Yup,, if the tubolaters alone are worth approx. 15 hp and the cmi's make 50 ,that makes the cmi's about worth 35 hp... 4 K for 35 HP is quite expensive and 7-8K for 70 hp is VERY expensive. If the headers were reasonabley priced in the 2K range I might consider it, but not for 3,800..

Re: exhausts for 496 engines ?
 

I agree, the price on these are not justifiable for 35 hp. :rolleyes: Hey, they woud sure look nice though... :D

Re: exhausts for 496 engines ?
 

Chris...you've been grumbling since the introduction of the CMI headers. :rolleyes: :D

The price point you're suggesting just isn't going to happen in a stainless steel tubular header.

We've sold more than 50 sets of CMI 496 headers in the short time since introduction. Every single customer that I'm aware of has been a satisfied customer.

If you don't want to pay the price of admission, I understand. Go whatever route makes you happy.

For those who do want the benefits of CMI headers, we have dyno sheets, real world performance numbers and phone numbers of customers to back up the claims ;)

Re: exhausts for 496 engines ?
 

Fred, I know i'm grumbling,, I want them but just can't see spending 4K for 35 hp.. and yes they would look and sound killer on my motor.. :D

Not only that, before you deleted your post w/ the dyno sheet I thought I remembered seeing only 42 hp ?? so that makes them worth about 27 hp which makes the 4K even more unjustifiable for 2 possibly 3 mph..

Re: exhausts for 496 engines ?
 

Actually that is CHEAP for the amount of speed & HP gained.
Best bang for the buck that I am aware of.

Re: exhausts for 496 engines ?
 

Na, how about starting with the props first.

The best gain that I've ever heard about from adding the 496 CMI's is 3 mph... :rolleyes:

That can be accomplished with a little prop work at a fraction of the price.

Re: exhausts for 496 engines ?
 

I have been wanting the CMI's also. The problem is they are not compatible with the Corsa Quick and Quiet Plus. I would spend the money if it were a direct bolt on. Now I have to change the complete exhaust system which adds additional $$$$

Re: exhausts for 496 engines ?
 

Chris......tighten up brother. They have meds to help with that short term memory.:D

The dyno sheets posted showed in excess of 55 hp. :drink:

Re: exhausts for 496 engines ?
 

Want no more......well, maybe jus a little more. ;)

Look for the introduction of the CMI 496 header kit which WILL BE COMPATABLE with the corsa system in April. :D :D

Re: exhausts for 496 engines ?
 

Fred, Not to be a ball-buster.. but if you didn't delete the majority of your threads I wouldn't have to remember, I'd be able to do a search and find out...

Re: exhausts for 496 engines ?
 

No problem Chris.....I looked down just last year and they were still intact. :D


But heck all this information is available at CMI's website:

www.custommarine.com

NEENAH, WI -- July 7, 2005 -- Custom Marine, Incorporated (CMI) has announced the introduction of a new custom exhaust package specifically designed to enhance the overall performance of any sport boat equipped with a propulsion system powered by a 496 engine. Equipping an engine with the exclusive CMI stainless steel 496 Sport Tube™ Performance Package is sure to attract attention at any dock. But it's on the water where this package will really turn heads. Simply adding this package to any stock 496 will result in adding nearly 60 more horsepower, boost mid-range torque by nearly 14 percent, boost fuel economy across the power curve and improve the engine's overall running quality.

"With the introduction of the 496 Sport Tube Performance Package CMI can address the needs of a very key segment of the performance boating marketplace," said Joe Zelinski, founder and president of CMI. "Until now, installing headers on a 496 package required having a machine and parts shop close by to create the necessary components required to make room for headers. With the CMI 496 Sport Tube Performance Package, performance enthusiasts can simply order our complete, easy-to-install kit."

The CMI 496 Sport Tube Performance Package comes complete with a pair of water-cooled headers made of 316-series polished stainless steel and required mounting hardware. Also included is CMI's exclusive 496 Relocation Kit, which includes all brackets, hoses and hardware needed to make relocation of select engine components easier and create adequate room for CMI's high-tech tube-style headers. Stock CMI tailpipes designed to fit a transom hole layout that is consistent with a standard Mercrusier® Bravo Drive transom hole pattern completes the 496 Sport Tube Performance Package.

The CMI 496 Sport Tube Performance Package is designed for application on all 496 engines.

Re: exhausts for 496 engines ?
 

The new Corsa tail adaptor is in reversion testing now. As for the rest of this thread, thank you Fred.

Re: exhausts for 496 engines ?
 

Now this sounds more like it.. :p
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We kind of decided to go ahead and offer a fix for the Merc 496 manifolds that some not so deep pocket boaters can afford. We have done a lot of flow bench work on the Merc 496 stock aluminum manifolds on our heads and we have developed a CNC program where we can run existing manifolds thru our 5-axis CNC machine and add some pretty nice cfm flow enhancements. This should also be very helpful to the guys worried about warranties and those adding superchargers and other power upgrades. We will be offering these reworked manifolds on an exchange basis at a very affordable cost. I will post the actual pricing very soon. Any body who has some stock manifolds around email sales @ raylarengine.com and we will most likely be buying up a few sets to get ahead of the demand. Again, Raylar tries to meet the simple needs of 496 owners without "deep-pockets"!!

Regards,
Ray @ Raylar
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Re: exhausts for 496 engines ?
 

I went with th Revolution Marine exhaust for my twin Raylar 600 project, but we made some plumbing mods and they seem to work very well. They have a polished that looks nice and is very affordable or you can go the Raylar method mentioned above for probably even less money. I think the CMI system is a rip off personally.

http://www.hotboat.com/image_center/...revexh-med.jpg

Re: exhausts for 496 engines ?
 

Raylar great news!!! keep us posted when the manifolds and pricing become avaiable !!!!!

Re: exhausts for 496 engines ?
 

What about warranty issues? Buddy of mine was in Miami for the show last month and asked the same question to Bob Teaque and some Merc who was at the teaque booth. Both said it won't affect warranty.

If thats the case, it's a another bonus for the cmi system.

Fred, any input on the warranty coverage?

Re: exhausts for 496 engines ?
 

I have to disagree. Tubular headers are expensive no mater what.
Does the price justify the HP gains?? NO WAY!!!
For that kind of money you can spend it elsewhere on the engine and get higher results.

For the bling and quality, They are NOT a rip off.
If I had bling money I would own a pair.
But I don't have bling money so I am opting to remove the turbulator plates and spend the bling money for 100+ HP mods, gas, and dinner for the family... :D

Re: exhausts for 496 engines ?
 

I spoke to a Mercury represenative at the Miami show. I received the same reply. The CMI exhaust alone would not void the warranty.

Re: exhausts for 496 engines ?
 

Fortunately, none of the folks who have actually purchased a CMI system seem to share your views. :D

There's a huge difference between casting an aluminum manifold and riser and building a true stainless steel tubular header. If money is an issue you've made a fine compromise.

One fact says it all: Over the last six years, Custom Marine headers, tailpipes and exhaust systems have been on more National and World Championship boats than all other brands combined. The reason is simple: When it comes to quality, performance and striking good looks, no one can touch CMI. No one even comes close!

Re: exhausts for 496 engines ?
 

I am sure it is a great product, just did not make sense to me personally on my twin Raylar project based on a cost/benefit analysis. If money was no object, I may have chose the CMI's :D

Re: exhausts for 496 engines ?
 

Yup, if money was no object I'd have a pair on my boat also.. but @ 4K it aint worth it,,, get the price down in the 18-2,200 and i'm in..

Re: exhausts for 496 engines ?
 

Lots of exciting news. I never got around to pulling the turbolators off last season but will make the time this spring. I don't really care about the speed gains (well ok, I do) and will be quite excited if it only makes it louder.... :D The other beauty is not a single penny spent.

Re: exhausts for 496 engines ?
 

Chris you kill me brother..... :D :D :D

Re: exhausts for 496 engines ?
 

Hey Fred,,, what do the tips they come with go for seperately price wise ??


P.S. if see you can sell similar CMI's in the 2K range, how long before we will see the 496's that low.. :drink:

Re: exhausts for 496 engines ?
 

What similar CMI do you see for 2k?

The only "similar" header that I'm familiar with is the CMI Sport Tube.

Last time I checked the catalog it had a retail price of $4700 in a Bravo configuration.

http://www.custommarine.com/headerapps/SportTube.php

Re: exhausts for 496 engines ?
 

we were lookin at around 9g a motor for the big cmis...3600 doesnt sound too bad for a complete system...

Re: exhausts for 496 engines ?
 

When we built the 1300's it was 2k per motor for stellings mufflers. That was in 99' though.

Re: exhausts for 496 engines ?
 

yeah that price didnt include mufflers either......., we looked at the 5in cmi switchables for our stainless marine gen 3s we got, but for 1600 each we dont need no stinkin mufflers :D im sure they are a great product, and the boat had cmis on it before, but we just dont have that kinda $$$ to spend

Re: exhausts for 496 engines ?
 

Cant blame ya. We are jsut gettin back to the avanti. Work got in the way.

Re: exhausts for 496 engines ?
 

Well I look at it this way every engine Merc produces that is a HP motor has the CMI's on it. Well except the 496HO and to me thats comparible to the 502Mag which didn't have CMI's either, but the HP500 ,HP525,SC600,etc. all have the CMI's on it. I went with em. Yea expensive, but for HP gains to equal my 496Mag to a 496HO which if woulda been ordered at the time of boat build was over 5k upgrade so I'm money ahead and if dyno sheets are correct have the same HP now as a HO motor. So now I have a extra $1,000 per engine to spend on other mods such as labbed props to get me another 2-3mph so in all I'm thinking theoretically I'll gain 5-8mph with propping and CMI's. Not bad IMO. :evilb:

I did research on blueprinting the hull and starting cost for that was 3k and people will beat the door down to have that done. Or throw 5k at a whipplecharger that VOIDS all warranties. So I still think the CMI's are a good bang for the buck usually in marine application it costs around $1,000 for 10hp so theoretically this system is 2k below cost :D

Re: exhausts for 496 engines ?
 

The benchmark in my world has always been $1000 per MPH in that 65-80 MPH range, was a good buy (somewhat hull dependent of course).

In a single engine application they make the grade as a fair buy per mph (what +3 average?) it would appear but....

In a twin engine application 7-8K is a lot of coin for 4 MPH ?
That's right up there, at 2K per MPH. Too rich for my blood.

Quality product for sure. It has to be considered though that alot of owners are in 496 boats because of the price point not only of the boat, but insurance ect...

These just aren't hitting me as enough of a "bargain" in terms of additional performance (specifically twins), for a crowd that is "bargain conscious".

No offense to CMI or Fred, as he's the man to go to for these I have no doubt. :D

but you get what I'm saying right?.

Re: exhausts for 496 engines ?
 

What were the plumbing issues, having to drill and tap a spot for an exhaust probe? I've got a 454 that I want to change the exhaust on, but I want to be able to use it on a 496 when I swap in the near future.