Why is my car slow???

[ace50421]

I have a 1988 LX. It is an original 45,000 mile car.

Stuff it has:
93 cobra upper and lower intake
65 MM throttle body
70 MM MAF
24# injectors
stock heads
cobra computer
mac shorty headers
3.73 gears
pro 5.0 shifter
alu driveshaft
Tremec Z tranny
Boxed upper and lower control arms
Tociko Illumina 5 way adj
Timed at 14 degrees

My car runs a 14.20 in the quarter mile at 97.4MPH. I seem to get a good 60 ft time. They are usually 2.1. The car seems to lose power in the high end. I only picked up .2 in the quarter mile when I put the cobra kit on my car. My friend has the same work done to his car that I have done to mine. He has a 77MAF though. I dont think a 77MAF would make that much of a difference. He smokes my car. His car has 160,000 miles on it. Should I put an A9l computer in my car instead of the computer since I dont have the cobra heads?? I lose to pretty much stock mustangs too. Any suggestions???