I have a 2000 Honda civic with a d16y5 engine in it all I was wondering is what can I do with it mod wise?

I have a 2000 Honda civic with a d16y5 engine in it all I was wondering is what can I do with it mod wise? - 1

Rebuild it, it is probably tired. If you want more power, sell it and buy something with a V8. There's no replacement for displacement.

You can upgrade parts as you replace them during maintenance. You can do things like rear disc brake conversion, replace old rubber bushings with polyurethane bushings, lower tie bar, light weight rims, throttle body spacers, intake, higher flowing exhaust headers, high flow cat converter, exhaust, springs and struts or coilovers, strut tower bars, sway bars, short throw shifter, steering wheel, seats and more.
Check out honda-tech.com they should have way more detailed information for you. From mods to engine swaps and rebuilds.

Honda D engines are designed for economy, not performance. Bolt ons, except for a turbo kit are useless. You are better off just swapping in a Honda B engine.