Whats the motives behind this, is there a performance increase? or is it just to clear things up under the hood and reduce a bit of weight while increasing emissions?

 

Someone is going to tell you to search, but...

It's to clear things up, reduce weight while freeing things up for future horsepower. If you're going to go with a header, you'll want to kill the nest first.

 

p.s. click on pratch's signature..

i gotta do ur dirty work

 

thx for the info guys

 

why would you remove the rats nest if your gonna get a header

 

Because that's when it can be completely removed without worrying about vacuum line conflicts for one. On the SA models equipped with thermal reactors, "installing a header" means quite a bit more than simply removing the thermal reactor (which can be difficult), that is also the time to remove the air pump, air control valve, EGR valve ('80 CA cars), heat exchanger, and the good ol' rat's nest, as the installation of a header makes these systems pretty non-functional anyway. The absence of the rat's nest makes it much easier to tune the engine, and virtually eliminates the possibility of vacuum leaks. All these motors need to run is a crankcase vent, a line to purge the tank, and a brake booster line, you don't even need to use the vacuum advance on the distributor, if you're so inclined. Simplification is a good thing, even if it doesn't result in any horsepower gain whatsover.