Running p13 now, heard some ppl say p28 and others saying obd-I gen GSR, not sure of the code... Any suggestions?

 

youd be better off to get your car tuned. however my car always ran pretty well on an obd1 gsr ecu. however i picked up 14whp after getting the car dyno tuned. a cant say for a p13. i never ran one. but yeah if you want a gsr ecu you want a p72. you will however have to make sure your block came with a knock sensor because you'll need it.

 

P13 is stock h22 ecu will work fine with just bolt ons. Like stated before a p28 or p05 chipped gives you the option to tune it a little better.