Anybody swap 93-95 (405hp) exhaust manifolds and cats to the early engines?

[mike100]

I'm considering splitting the difference between long tube headers and the highly compromised early manifolds. This will help me get through the emissions check and hopefully be worth a little extra pop over the early pipe set.

Do the later pipes bolt up to the cat back exactly the same or are the a different length?

Even worth it? I'll be keeping the headers on the back burner for a bit either way, but it would be nice to have the car quiet for a little while.

[fletchusmc]

I've got my 95 up in the air right now. Will be more than willing to take any pictures or measurements for you.

[Hib Halverson]

I'm considering splitting the difference between long tube headers and the highly compromised early manifolds. This will help me get through the emissions check and hopefully be worth a little extra pop over the early pipe set.

Do the later pipes bolt up to the cat back exactly the same or are the a different length?

Even worth it? I'll be keeping the headers on the back burner for a bit either way, but it would be nice to have the car quiet for a little while.

In reality, the early manifolds are not "compromised." It's the late manifolds which are compromised...to the tune of about 5-hp.

Put the late manifolds on an early engine and you loose not gain power.

Be happy with your early "header cats".

[mike100]

In reality, the early manifolds are not "compromised." It's the late manifolds which are compromised...to the tune of about 5-hp.

Put the late manifolds on an early engine and you loose not gain power.

Be happy with your early "header cats".

I see, the 2 cylinders get cut short on the primary length as the merge into the bigger tube.

[Hib Halverson]

The 93-95 manifolds were changed to eliminate a reversion problem which, if the engine was in decel and any cat substrate was loose in the space ahead of the cats, it would get sucked into a cylinder though an open exhaust valve and damage the engine.

Unfortunately, that cost 5-hp but they gained 35 from the changes made elsewhere in the engine so the net was 30-hp.