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2G FP Exhaust manifold

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Type1DSMr

Proven Member
1,114
149
Jul 27, 2014
Jasper, Indiana
So I just received my new replacement manifold because of a bad coating on the last one, and it has a knick in it were it was filed down. It can be seen from both sides, plus there's a hole in between the runners. However, I don't believe it goes all the way though. Here's some photos and would like some opinions on how to fix just in case they don't exchange since this is the second one.
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They are both casting defects.

The nick is most likely a non-fill from the casting process. Most common is moisture in the mold and when the molten metal is poured it creates a steam pocket. It looks like they blended the pockets.

The hole is a similar issue in that it is a bubble in the casting process. A bubble of air got caught there and again caused a metal non-fill. The bubble does look deep but is in the webbing of the two ports so it will not cause any leaking or strength problems.

Both are not visually appealing but don't look to affect the quality or performance of the manifold. If you want to be absolutely sure you can send it to me for FPI inspection and I can verify any cracks. Given FP's reputation I am assuming this or a similar inspection has been done already.

Hope that helps.
 
Thanks for the responses. I'm not worried about the hole because I stuck a bobby pin in it and it doesn't go into the mani. The knick is my concern because I can see its a very thin piece in between it. I don't care about visuals as it's on the bottom side. The coating looks nice and thick this time like a wrinkle black which I like. Force performance has done an outstanding job with helping me out since the last manifold had a weak coating on it and they sent this one to me for free. FP is great supporting vendor which we all know. If anything could I put a thin layer of JB weld on the outside to make sure it's sealed up?
 
Welding this is extremely difficult. Not impossible but difficult. It could cause more issues than help. You run the risk of warping, pocketing, and most likely cracking

JB weld won't do. It might hold for a bit will eventually fall off.
 
Why do people run these manifolds? Ive never seen a dyno comparing this manifold to a stock one. I did see a post where someone went from a FP manifold back to a evo3 manifold and they lost 7hp on the dyno but that was done on different days.
 
The big reason is availability and quality. As our cars get older it becomes more difficult to find good exhaust parts like a manifold. These are well made and use a very good alloy. So in comparison, a questionable used manifold from 20 years ago may give 7 more horsepower but may give out and crack 3 months down the road. These are new and odds are outlast the car.
 
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