will parts fit from an 91 civic si to 88 civic hf i want to know if the fenders,bumpers,renforcementfrom the si fit on hf i also want to know if the guage cluster would be able to change over . if i were to swap the ecu would the horsepower increase alittle.will the si ecu even work on it.
is there a web site that i can go to learn how to swap the rear disc brakes over.

 

im not positive but.... I think the body stuff would swap over. The guage cluster from a 88-89 was different than the 90-91, I dont think they will fit. I dont think the si ecu will help at all either. hope i helped a little.

 

Superhatch is right, you need an 88-89 cluster. Other than that, everything else is fine. You won't gain anything from the ecu compared to an 88 si ecu. HTH

 

Oh the rear trailing arms on 88's are different from 89-91. Just FYI. You could swap the rear disc's of of your 91 onto the 88, but you'll lose some of your handling abilty that the 88 are know for.......JDM(ITR) style rear trailing arms give a slight passive stear effect in the rear of 88, making then a bit more agile. Though US customers thought the cars were to "twitchy" so the 89+ CRX cam with a totally differnt rear traling arm design. More stable, but less agile.