Exhaust manifold choice
 

If u had your choice what exhaust manifold system would you use between emi Thunder,,or gills

[QUOTE=jdf4068;4490592]If u had your choice what exhaust manifold system would you use between emi Thunder,,or gills[/QUOTE

Neither ask your wife, she'll tell you why.. Lol. Had to say it. Power wise no difference but Gil's tend to crack. For that reason alone I'd stay away from them if emi's are available to you. Honestly though by saying neither I'd look for a set of stainless marine manifolds. Built much better and will see a little hp gain over others mentioned in anything over 500 hp or so.

x2 for Stainless Marine. Very nice quality and great 5 year warranty. You will be hard pressed to find anything negative anyone says about them anywhere... Not the cheapest but worth every penny. I got a good deal on both of my new sets so it was no brainer with all the research I did.

Lol..if she had her way she stick a set of Bassett twist's ,,,thanks ...I for got abt the stainless ones ,,

[QUOTE=getrdunn;4490603]
Getting ready to start on the 509 build this winter ,,looking for ard 500-525 on hp..

There's been some used sets floating around recently on swap shop also. You never hear of any issues with these and cost wise new or used are all close in price.

Btw to be perfectly honest if I had my choice I would as well.

Oh I would too. Have 4 sets ,,,,,the 509 will have alum heads dart 320 and single plane,,,9-1 comp,,just haven't pick a cam ..I know it wont be m.k. Stuff ,,lmao

Nice build. I know your not asking but will throw a little advice in here anyway regards to cam and look seriously into the 741 cam. Friend of mine here has your same set up with 741 cam and making right near 650 hp. There's a lot of new grinds that will work also but... Just an all around nice combo.

With those dart heads, 509, even only 9:1, 550+ should be a cake walk.

The SM have a reversion damn in the tails, others like EMI and Gill don't.

Stainless Marine

Eickert Lightning manifolds

emi manifolds, dry tails. 115 hours with no problems.
http://i296.photobucket.com/albums/m...psl0edexmr.jpg

Thanks guys

Thunder & Lightings on a 598ci

The wife but a money cap on this issue ..really like the lighting maybe I can sweet talk her ...

EMI Thunder @ 1020 hp.. :)

http://i130.photobucket.com/albums/p...psvlq0jqf1.jpg

Is that a clamp on flange

No..

I had EMI change the water outlet to their "water damn" style and extend the inner pipes some to further prevent reversion..

They necked the extension pipe down some then added a flare help throw the water against the exhaust hose and to prevent it from running back up the pipe...

http://i130.photobucket.com/albums/p...pscvxbozph.jpg

http://i130.photobucket.com/albums/p...psgghu8uwf.jpg

Cool ..now I know it can be been and no issues..thank u

Stainless Marine Gen III's 👍. Here's mine with custom dry tails and 8" long GGB muffler inserts.

https://youtu.be/2pPJCuYser8

Does anyone have a pic of the stainless marine "reversion dam"? The last set I bought did have a ring welded over the annulus with holes for the water to flow out but it wasn't what I would consider a dam. The most effective looking dam to me is the one in the CMI tails before where the water is dumped. I know I'm in the minority here, but I prefer wet exhaust (I know, I just set myself up) mostly because I LIKE silent choice; which has a nice/tolerable sound when open because of the Y pipe dampening and water and luxury quiet when you want to socialize. CMI/Merc had some pretty good success functionally limiting water ingestion with the dams and silent choice with some moderate overlap cams. (I know, I know, there were water ingestion problems, but not when everything was in good shape) By almost all accounts, the CMI's are effective at limiting water ingestion and it has to be because of their "dam" design, so I'm real curious what SM's design is like