Will a F22B2 exhaust manifold fit a F22B1? Do the cylinder heads have the same sized exhaust exits and shape?

 

it will fit. you will have to extend the o2 sensor wire

 

Yes, and Honda calls for the same exhaust manifold-head gasket for both.
The downpipes are different (however)
The B2 version has a 4x1 Exhaust Manifold and uses a single pipe Downtube
The B1 version has a 4x2 Exhaust Manifold and uses a dual pipe Downtube which collects into one, just before the converter.

P

 

P, are the header sides of the cats the same? i know on the B1, the cat -> midpipe is 3 bolt flange, while the B2 is a 2 bolt

 

On the EX B1, the front of the Cat bolts to a small pipe section by what appears to be two bolts.
http://www.hondaautomotivepart...82%29
On the Lx B2, the front of the Cat also bolts to a small pipe section by what appears to be two bolts.
http://www.hondaautomotivepart...81%29

That's all I can come up with; unless we've got a Honda Parts Guru in here that can shed some light here.

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there are certain SE and LX's that have the odd ball 3 bolt cat. my friend has one.

 

Thanks for all the replies and info. They were helpful. I decided not to use the f22b2's exhaust manifold because I would have to use the header pipe in which seems more restrictive than the f22b1's 4-2-1 exh. man/header.

 

Good choice.
It's really surprising once you look at the 'b1 Exhaust Manifold and downpipe. Is it a co-incidence that most all aftermarket headers copy it? In truth, I'd rather have the cast Honda Manifold; It's better at attenuating under-hood noise (avoids the noisy din coming from tubular headers).

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