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Best 496 headers?

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Old 02-28-2007, 12:20 PM
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Originally Posted by dana marine products View Post
Just to clarify, that lean condition is the result of only adding the exhaust. No ECM modifications were done. That lean condition is exactly what we've being talking about in this thread. The 3 pound fuel pressure increase brings that number back down to 13.5.

As previously stated, I find it amazing that no other exhaust company is suggesting the fuel pressure increase.

Anyways, we've done the testing and make the suggestion to do the fuel upgrade.

Thanks for helping to clarify this better.. Jamie / Lakeside
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Old 02-28-2007, 12:20 PM
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Beautiful....proof is in the pudding. Sign me up for a set.

Let me know when you are ready... Jamie / Lakeside
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Old 02-28-2007, 01:33 PM
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noticed the dyno sheets showed using premium fuel ? what octane ? I use 89 octane .
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Old 02-28-2007, 01:39 PM
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noticed the dyno sheets showed using premium fuel ? what octane ? I use 89 octane .
Yes, please. I use 87 and dont really intend to buy premium in mass quantity this summer.
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Old 02-28-2007, 01:54 PM
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Originally Posted by GRSFAST View Post
Sounds Like An Incredible Exhaust System !! If This System Truly Brings The 496 Hos To 478 Hp (+53) , That Makes Them Equivelant To The 5oo Hp !! Will The Width Of These Manifolds Be A Problem In A 04 31 Sonic ? The Engines Are Very Close Together ...see Picture....

Your application looks like it may be tight & Not fit. If you call me I will tell you how to measure to see if they will work.. Jamie / Lakeside 570-639-2628
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Old 02-28-2007, 02:24 PM
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Premium fuel is not required with the Dana system on an otherwise stock set up. However the independent dyno shop used premium when running it on the dyno, thats why it shows that. You may still run the 87 octane in it.. On a personal note even though that is all merc says is required, I personally try to run 89 in my personal 496 set up. Eventhough I know I dont have to run it in there. There is not much price difference so therefore I spit the difference.. jamie / Lakeside
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Old 02-28-2007, 03:44 PM
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Jaime hit the nail on the head. Premium is not required, but that's what was in the dyno fuel cell.
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Old 02-28-2007, 03:53 PM
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For those that are curious as to where to measure here is a visual to help you.. Jamie / Lakeside

Keep in mind I believe you will need 1.25 to 1.5" more width than your existing manifolds (not risers). If it close the inner manifolds can be shaved a little over 1/8th but not quite 1/4".. Please take in to consideration the center lift if your boat is equipped..
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Old 02-28-2007, 07:03 PM
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Originally Posted by dana marine products View Post
Jaime hit the nail on the head. Premium is not required, but that's what was in the dyno fuel cell.

91 or 93 premium? 87 or 89 octane going to be a little less HP gain?
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Old 02-28-2007, 08:56 PM
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91 or 93 premium? 87 or 89 octane going to be a little less HP gain?
Actually unless they have changed things, Or my memory is lax, it should not make much of any difference. Lower octane fuel burns faster thus the knocking in higher compression engines. The higher octane burns slightly slower & a bit more controlled whick is what aids it in reducing knocking & heat.. Jamie
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