I have a 91 convt. I see a lot of front strut tower stabilizing bars and cone air filters on ebay for $10-$15. Are these modifications worth doing since they are so cheap.

Do they work ?

 

not really, air filter would be okay, and a decent exuast, the strut bar wouldnt be noticable unless you start running into probs from chassis flex

since you have a s5 vert, which is the slowest rx7
i wouldnt worry too much about hopping it up alot, I d try to make it look better since its a pretty cool and good looking car

but thats just my opinion