Got one on my 2000. It was the 1st thing I did. The difference is immense. So much more mid range pull. I didnt think it would make too much difference.
However, our standard fuel has a 97 octane rating, with premium fuels at 99 rating. The premium is about 30 cents more per litre, but it lasts longer and gives more power.
I cant comment on what, if any, gains will be made on your 95 Octane fuel.
I then added a Dyno jet kit awhile after, and again, a massive difference was made.
Sorry if my reply isnt much help, but its all the experience I have to share.