I have a 91 honda civic LX 16valve 1.5l. Currently its stock. I wanna know what i can do to make it quicker. I have an intake comming which will add 8 - 15hp which if it gave the fullest, would give me between 100hp and 110hp. the flowmaster muffler i plan on buying adds 4hp - 15hp. But what else can i do to it.
Quick is a relative term.
Some simple math:
Stock: maybe 75-80hp to the wheels
Intake and exhaust, realistically you'd gain maybe 5-7hp, and that's pushing it.
You're best bang for the buck would be swapping out the lame DPFI for a MPFI, first and foremost.
Stock airbox, drop in aftermarket filter, with removal of resonator(behind bumper, passenger side)
Nice stainless, low tone, non-obnoxious tip exhaust for decent sound and durability.
With all that, you'll gain a COUPLE ponies, seemingly better throttle response and gain a few MPG's.
Enjoy it for what it is.