is there anything i have to block off to install headers or do something special when installing them?

 

you mean a "Header" correct? The header itself? no. Other parts of your exhaust? Maybe, S4 or S5?

- chris

 

Just a bolt on, use a gasket also, soemtimes you might have to replace your 02 sensor. Otherwise its not too bad at all, just take your time.

 

k i know u need a gasket in the front do i need one in the back too?
its a 88

 

I would get a rear gasket too, what type of header? are you going to replace your midpipe (CAT) also? if so, you should get a header with the 6 port activation tube, or more reliably (and more accurately) look into alternate methods of opening your 5th/6th ports.

- chris