Whats your thoughts on CMI headers?

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04-13-2019 | 11:38 AM

#11

F-2 Speedy

Platinum Member

Joined: May 2012

Posts: 11,435

Likes: 3,964

From: Midwest & T-Rock

What 44 said, the dual bolt pattern with cool collar are the ones to get, or GenX direct replacement for the 525,600,700, funny how people bash them that have never owned them,

04-13-2019 | 12:51 PM

#12

BUP

Banned

Joined: Jul 2011

Posts: 9,594

Likes: 46

From: Ft. Worth TX

for a stock 496 total waste of money. especially for a heavy cruiser boat with inboards and if it has a muffler box. ??. Your prop options are not that good for any performance gains anyways.

Last edited by BUP; 04-13-2019 at 12:54 PM.

04-13-2019 | 04:25 PM

#13

RaggedEdge

Registered

Joined: Jan 2004

Posts: 5,325

Likes: 112

From: Northern NY

Quote:

Originally Posted by mnm99

Thanks guys. I have no Idea about the reliability and thank you for the input.. It wouldn't be going thru hull either. Just a replacement for stock. Yes it's a 340 cruiser with V-Drives. I'm sure I won't go the header route with this boat the more I research, I was just seeing if anyone ever used the CMI. Within a couple years I'm hoping to be in a gofast like you guys.

Nice looking boat you have there. Like others here have said you would likely see little if any performance gains going to any hot rod exhaust system. But I do understand where you are coming from. Many years back I had a 25 Sea Ray Sundancer with a 454, retrofitted a set of Pachanga Vernatone mufflers and thru hulls into it, sounded like an old 396 SS, cool as chit. Did not go one MPH faster but was a real conversation piece, and made me smile every time I started it .

04-14-2019 | 06:06 AM

#14

Dean Ferry

Charter Member

Joined: Nov 2000

Posts: 7,215

Likes: 401

From: Merritt Is. Fl. USA

Quote:

Originally Posted by Wildman_grafix

I agree the E-tops are not much more performance then a better design manifold. The KE you are talking about if you see a cut out are basically long tube headers.

But if he just has a 496HO I doubt he would notice and for that matter I have dyno sheets that show the KE lose some mid range on a small motor.

If if I had a staggard boat and needed to buy I would buy the KE’s and paint to match.

WG,
That's why I want you to paint my KE's I have in garage!
Thanks,
MD

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