Just some questions I have about installing headers.

1. On old carburated cars you needed to readjust the jets when u installed new headers - do you need to do anything like this?

2. Do you need a fitting clamp to hold the headers to the cat or are the screws enough.

3. How much are exhaust manifold gaskets from the dealership? ... (where i can i get them cheaper?)

 

what kind of cars are you installing them in????
on a fuel injected honda, all you have to do is remove the old ones ands install the new ones, you can even use the same gasket.

 

sorry, this is install on a 94 civic ex

I can use the same gaskets? even after 160k miles?

 

You can get a new OEM Exhaust manifold gasket here:

http://www.prostreetonline.com...X9295

 

same question: could I use my stock gaskets even after 160k or will i need new ones?

 

In response to the other question..

you used to change jets because with the headesr, you have more efficient airflow, so you could use more fuel to keep the air/fuel ratio where you wanted it.

On the honda, in closed loop, it will adjust automatically. In Open loop (wide open thottle), it isn't going to adjust for it. You'll run a little leaner after adding headers, or an intake, cams, etc.

Thats why people either: a)get a new 'chip' for their ECU b) increase the fuel pressure a little to put more fuel in the engine c) use a S-AFC/V-AFC to add extra fuel d) Use something like Hondata/UberData/TurboEdit, etc to adjust the computer settings to add more fuel.

Those things are the equivalent of changing the jets(and a lot more, too).

If you aren't making a lot of changes, then using a S-AFC or something will be good for fine tuning, best done on a dyno. Rasing the fuel pressire a bit will also work.