1G Manifold dilemma: Find another 2G or use FP Race?

[Drewpy Dawg]

I need an exhaust manifold for my build. I have a used FP Race manifold but I chose to go with a 2G because the FP is reportedly a bit laggy on smaller turbos like my EVO 3. I’ve been through two 2G manifolds so far and I’ve found cracks in both. I don’t want to spend a lot of time and money buying used 2G manifolds hoping to find one that’s not cracked. I want to keep the build moving along. Should I just use the FP and accept some increase in lag? How much of a difference would it really make, taking into consideration that I’m also running 9:1 pistons?

 

[92AWDHX40]

I would pick up a FP and call it a day both are good to have but if you can find either get it and run with it. 2g manifolds remember they are over 30 years old if it isn't cracked now it could be shortly after you install it then you have to take it off and. You risk issues with those damn exhaust studs stripping out just saying or the work involved removing the manifold not as difficult as my T3 but I've owned both 2g and FP . Never really could tell much difference on my Evo 16g but that was over 25 years ago when I ran those.

 

[Drewpy Dawg]

Thanks for the reply. I may still take your advice on the FP, but I'm going to wait for the moment. While getting some other parts out of my storage shed I discovered something I had completely forgotten about: a brand new Graywerks exhaust manifold that I got cheap some time ago. I wasn't going to use it because it's not nearly as nice of a casting as the OEM 2G, but I think I'm going to try it after all. I've been smoothing out the rough cast outside with a sanding disc on my die grinder, and I'm going to smooth the inside of the runners and port the collector. It may not be as good as a virgin OEM manifold but is definitely better than an already cracked unit. At some point I may upgrade to a bigger turbo and I'll have the FP manifold on hand for that. For now I'll have stock appearing set-up and I can still use the stock 2G heat shield.

 

[CrackedDSM]

I'd go with the 2G Manifold. They sell them brand new still on eBay and stuff.

 

[19Eclipse90]

I'd go with the 2G Manifold. They sell them brand new still on eBay and stuff.

Sorry, but, “Prove it.”

Searched for months and couldn’t find a new 2G manifold anywhere.

 

[Drewpy Dawg]

I haven't seen new OEM manifolds available in years, only Dorman or ATP. Only ones on eBay are used and the two I've bought have both been cracked.

 

[19Eclipse90]

The Dorman is closer to a 1G casting. Regardless, they seemed to be out of stock everywhere I looked. The only ATP manifold I could find is the 1G auto version which does most of us no good.

I would have happily settled for the 2G ATP casting. Begrudgingly, I would have settled for a Dorman because new is better than used and cracked.

 

[CrackedDSM]

Damn you guys are right.


How do you old guys deal with the “well it was like that last time I remembered” only to find out the “last time” was decades ago. Lol.

 

[Drewpy Dawg]

How do you old guys deal with the “well it was like that last time I remembered” only to find out the “last time” was decades ago. Lol.

I drink

The Dorman is closer to a 1G casting. Regardless, they seemed to be out of stock everywhere I looked. The only ATP manifold I could find is the 1G auto version which does most of us no good.

I would have happily settled for the 2G ATP casting. Begrudgingly, I would have settled for a Dorman because new is better than used and cracked.

I guess I lucked out by stumbling onto this ATP/Greywerks 2G when I did. It's cast iron and not as hard of an alloy like the OEM manifolds. Makes it easier to grind. Only time will tell if it holds up, but as you said, any new manifold is better than a used cracked one.

I bought an EVO 3 manifold from RRE for my last Talon, back in the day when they were still available new. I sold it many years ago when my car was mostly boxes of parts in storage and I needed money. I kick myself for that now because that would be the perfect choice but from what I can tell they are simply unobtainable now.

 

[chrysler kid]

The Dorman is a 1g and has a cast brace across it, the ATP is close to a 2g design, both are hard to find and the Dorman was discontinued last I searched.

I would use a FP manifold and a manifold blanket. Higher manifold temp typically means the engine exhaust housing temp expels the gasses more quickly to the housing, so on a daily driver you might see a slightly quicker response time in low throttle settings. (I would love to see actual studies and data on exhaust velocity vs temperature)

The FP is also more durable, if you plan to keep the car it’s an upgrade in reliability, performance, and quality. I would rate this as an upgrade similar to getting an aluminum radiator.