You have a 1.5L D15Z6. i-VTEC. It's an 8 valve engine with the early experimental VTEC setup. You have an anemic throttle body and a tiny exhaust that resembles the CX setup. Your car is wired differently than the other 3 hatchback models. The cooling system is different, too.

Getting a cold air intake would be an improvement, but you will have to be creative with making a 2 1/2" pipe fit a 44mm throttle body. It can be done. People do it.

Replacing your factory exhaust WILL help. Don't go bigger than 2" on the mid-pipe. Replacing your header may give you some headaches with your o2 sensor because of its location. Most headers will require an o2 senor in the bottom of the pipe. Yours is up high near the head, and it needs to be there.

A cam gear is a nearly worthless upgrade on a SOHC. So is just about everything else, but don't take any of what I'm saying as though I'm bashing your car or any other civic... I too have a 1.5L that used to be 8 valves. I've been completely through it, and although I built another 1.5L for my car, I came to the conclusion that the only way to make decent power with a CX/VX/DX is to swap them. Save your money. Don't buy mods, look around for an engine (that easily fits your car) and swap it.

Don't fall for the Vornado, Split-Fire, Knology type snake oil hype. Making power doesn't depend on a brighter hotter spark or swirling air in your intake pipe. It's about flowing more air and fuel through your engine, and i-VTEC or not, there's not a lot of that going on in a 8-valve 1.5L. There are a lot of VX owners on this board that will tell you this same thing.

What's most important is to do what you like and have fun doing it. If you want to go fast and look slow, that's great! You're already leaps and bounds farther ahead of most newbies on this board even though you're new to the hobby.

Welcome to HAN.