hey,
i picked up a vafc (version 1) to put into my 95 ex coupe. Im running a bone stock b18c5 (intake, exhaust). My car's running a little rich, so i thought maybe a vafc would help lean it out a little along with giving me some hp gains.

Now i hear, it could be potentially bad for the engine if i have it untued for a period of time. should i put it in or not??

 

Put it on, set it up, but don't adjust the fuel or vtec settings. It'll run the same as before.

Then go get your car tuned with a wide band o2 sensor at a dyno. You'll likely pick up a few hp up top.