Replace exhaust manifold or not on a 2006 Lj Rubi

[Foo]

I'm replacing a cracked manifold on back bank. Front bank is not cracked although I bought one for the front also anticipating a crack. Should I replace the old good front exhaust manifold or keep the old one installed? I don't know if it is original or not, is there a way to tell if it is Mopar? I didn't look as it got dark on me. Thanks for the help.

 

[chili_pepper]

I'm replacing a cracked manifold on back bank. Front bank is not cracked although I bought one for the front also anticipating a crack. Should I replace the old good front exhaust manifold or keep the old one installed? I don't know if it is original or not, is there a way to tell if it is Mopar? I didn't look as it got dark on me. Thanks for the help.

If you're changing out the manifold (or even part of it) I would think you'd want a new manifold gasket...which is shared by both exhaust halves as well as the intake manifold. In that case, you'll need to pull the not-cracked half as well, after that it's up to you whether you replace it.

Factory manifolds will have a pentastar cast in them as well as the part number (not my picture).

 

[KennethS]

My question would be do you trust a replacement part over the factory part?

 

[GoldenGorilla]

My question would be do you trust a replacement part over the factory part?

Felpro are very good.

Replace it.

 

[KennethS]

FelPro makes exhaust manifolds?

 

[GoldenGorilla]

FelPro makes exhaust manifolds?

Sorry, thought you said you already had the manifold and needed the gasket. They do not make manifolds.

Really you can't tell if a crack is forming unless you magnaflux the part.