hello.....im not that deep into the mech. side of cars.

heres my situation:

1991 GXL stock everything.
im planning on headers, bonez high-flo cat, borla system, k&N air intake, maybe pulleys.

how (if ever) will this affect gas milage?

and will this get me to 200hp? if not, can someone give me an estimate?

 

these mods should not drastically affect your gas millage.
However assumming that you car is running 100%, I would not expect to see 200whp without having your engine street ported, which unfourtunately requires a rebuild.

 

200 what at the fly? ahaha No way dude... you need mor ethan just simple mods get ready to start PORTING the TB and the engine maybe even get a ported manifold..

 

Then my car has to be street ported.

 

port for horse. those mods might get you 200 at fly though.