whats are some ways to increase my 99 civic dx speed?

Change your intake, put in an aftermarket high flow air-filter.(Stock Air Filters restrict airflow) Install a high performance catalytic converter and low restriction muffler, Nitrous System, Larger Set of Wheels, (Rims) and Low Profile tires. I recommend Toyo. And Slap a turbo on the sucker and watch it fly.

Lighten the load. Replace the metal hood with carbon fiber. If it has air conditioning, take it out. You can take out the back seat and anything else non-vital to operation. Get it lowered and/or get a body kit, basically anything that can cut wind resistance. You could also do an engine swap for more hps. Don't forget the new turbo kit.

OK, my daughter and all her motorhead friends are really into Hondas. I hear this stuff 24/7. It must work, they're winning on race day.

Spend about $6-7 Gs and swap it with k20A or B18C5. You can also do internal work on the engine too. Bolt on's will give you at best only 20-25 Hp and you can use premium gas its does help you will feel it in the car nad your poket.

Your ultimate guess in case you decide on for horsepower is to maintain your DX inventory and do advancements to get greater useful gasoline mileage. to return on the ingredient of something such as genuine potential will require substantial $$$$$$'s and after spending all of the money the transmission will blow up in an extremely jiffy. shop up funds and purchase a automobile with a VTEC engine and get rid of as a lot weight as you may from the automobile, alter the engine, intake and exhaust gadget to boot as suspension enhancements and you will shop funds to boot as frustration in the tip.

there are a lot things to add to your civic, but how much are willing to spend, and why would u want to spend on trying to make a FOUR cylender fast.(its not worth it). granted there are a couple fast ones out there but even still they prabably spent a few thousands if not more. If you are trying to go fast, build it only for the LEGAL strips. Some of us out there want to stay alive while we are trying to get work or home.

Put a spoiler on the trunk lid, a fart pipe, and some NOS stickers on it like all the other ricers

Short air intake (with low restriction air filter)

Set it on fire and roll it off a cliff and buy an 1G or 2G Eclipse/Talon.