I have no idea where to find any performance parts for my car. It's a 2001 Volvo s40 1.9t. I'd like to upgrade the injectors cams and fuel pump. Any help is appreciated!

 

There are a few companies specializing in Volvo performance upgrades. Here is one: Welcome To Elevate Cars | Elevate Cars

You might find the older 2000-2004 models have a very limited upgrade support.

Also, try the Swedespeed forum simply because there are more active modders than I've seen here.