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Running CMI e-tops on 540s. Looks as though I made a good choice.
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CMI Big Tube E-tops should be the best for a 900HP 540 blower motor. Strong, reasonably priced and real pretty in polished! Just my two cents.
Regards, Ray @ Raylar |
From what I have seen, in salt applications with 900+ hp big tube set ups, you get to 225+ hours with either Stellings or CMI you can get ready to start chasing cracks at the collector and flanges. Once they start developing, they just keep on coming. I haven't heard of any official studies done nor do I expect a mfg to divulge their warranty or product health numbers.
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From what I have seen CMI makes two types of Headers , The ones that Leak and the ones that are going to leak . Just my $0.02.
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Originally Posted by Elite Marine
(Post 2719366)
Mercury headers are thinner and of a different alloy than the CMI headers. You guys really need to keep your facts straight.
I dont know of anyone that has had a failure of CMI headers, not the Mercury product!!! If you pick up a set of 500 EFi headers vs an Elbow Top, you'd see what the difference is. They are the best flowing exhaust on the market - period!! Thats why Mercury buys them, except they make them out of a less quality alloy than the SS CMI does. And they are thinner!! |
Besides the $$$ what are the major performance differences with the Big E-tops versus the Big Tubes? Also at what HP is it necessary to go with the stepped E-tops?
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Have had imco powerflows,Eickert manifolds, cmi e tops, cmi big tubes, other than the prices, have'nt noticed any difference in performance, with them, I've had from 725hp to 1150hp, save your money.
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I have not heard of a lot of CMI E-tops cracking and leaking, I cannot say that about regular or big tube CMI sweepers. Most blower motors will make better power with the big tube E-tops than with any sort of long tube header. I understand that the Stainless Marine High Torque III header/manifolds also work very well on blower motors.
Just my two cents. Best Regards, Ray @ Raylar |
Here is some CMI comparisons done at Keith Eicherts. All done on a NA 500 CI
Big E-tops - 765 HP Sport Tubes (1 7/8" ID) - 785 HP Big Tubes (2 1/4" ID) 800 HP |
Blower motors generally need different headers
I believe this post was started with the motor being a 540" blown motor. Header results for blower motors will be totaly different than those for a N/A motor. Just thought I would clarify so those not in the know would not get further confused.
Regards, Ray @ Raylar |
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