I plan on autocrossing it next summer so I plan on upgrading the suspension components but since im still in high school i'm on a very tight budget and working 3 jobs to try and make it the best.

The car:
5L V8 TPI
Automatic
Stock everything

Any ideas on how to improve the car?

 

3.73 posi rear, MSD 6al ignition box,headers,scrap the smog setup, gut the cat or get a better flowing one and get straight pipe or a good muffler

 

How much would a 3.73 posi rear cost?

 

depends, look around on the board here, or you could message tpi-hearse he has alot of parts, hes always selling posi's. I bought a entire posi rear with new brakes for 100 bucks and i found a set of slightly used 3.73's on the board here for 100

 

but I read the posi rearends should be rebuilt every 40K miles. is that true?

 

I've never heard that one but it is a possibility

 

raceing geek,if it were my car and i was on a tight budget i would look into a set of air bags for the rear springs,easy to install and help alot,easy to adjust to maximize ride charistics to specific corses,about 100 bucks or so and a set of adjustable shocks/struts all the way around,there are affordable ones out there,but remember u get what u pay for so if u can save for the best u can get and u wont b let down buy the results,not saying spend 1000 ,prob 100 each so around 600 is the least u should b willing to spend for the suspension,the suspension is the BIGGEST thing u can do to make it faster around the track, power means NOTHING if u cant get it to the track

 

What is the differance between the Koni Yellow and the Koni Red?