yeah like every1 else is saying. i saw a dyno where they gained about 9 after i/h/e. props 4 the choices in your i/h/e.

 

You'd need to tune for a new cam, I would think.

 

Yeah you're going to love that exhaust. I have it on my rex and it sounds sick!

 

correct me if im wrong but it seems based off of I/H/E install on my last DX hatch that if you dont get a tune due to cost you should at least get an FPR with Gauge and add an Air/Fuel ratio gauge to prevent running lean due to added airflow.. when it was cold out and i would start my car if i let the clutch out too soon the car would die like there wasnt enough fuel pressure.. and if this is the case i would assume you are losing HP due to the same fact.. not sure if you would need the bigger fuel pump as well .. but on my new hatch i made sure that is installed as well so i will give exact #'s once i get it Dyno'd here within the next month i hope .. this way everyone, myself included can get some kinda guess on what they can expect.. at least from a DX model with bolt on's only and no tune

 

I always recommend tuning, but unless you mess with cylinder pressure, I don't think it's worth it.