ok ok i know alot of you have probably gone over this millions and millions of times and have told millions and millions of people the answer to this and trust me i searched i do more looking then actual talking here but now i have tyo know this. Ok i have an 89 crx hf i am swapping a 91 Ls (obviously integra) engine but my friend just offered his 93 LS, i was looking around and i noticed that there were some differences between these. The 93 has i believe 10 more horsepower or something like that, but still has the same b18a engine so really what is the difference between the years 90-93 for the Ls engine is it that it that the later years are tuned better from the factory, better ECU or is it something else. please respond because if there is a huge diffrence then i will take out the clutch, waterpump, and other tuneup things i have put in the 91 and put in the 93 and if its not that big of deal then i will just keep the 91 and save myself the trouble. thanks alot for your help.