i got a 88 iroc 305 tpi and i wanted to do some intake upgrades. some options i was thinking bout were the slp intake runners, throttle body spacer and air foil. i herd that the spacer and air foil arent worth it but i thought i would just ask. not lookin to spend alot of money just wondering if any of these things are worth it.

 

1) SLP runners, good upgrade with other mods. Just don't expect there HP numbers,but the TQ will go up, (I have SLP runners)
2) Thottle body spacer, Not used on TPI (TBI part)
3) Airfoil, very small gains 1 to 2 HP. (again I have had one for about 15yrs or when they first came out).

My opinion...Go for headers & 3" catback exhaust for a bang for the buck.

 

I agree. The airfoil is not really worth it.