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.