engine mod??

i have a D15A2 where can i find the parts for the engine?
i cant find them in stores or online.

i mean porformance parts

You won't find new performance parts for this motor. This motor is too old for aftermarket manufacturers to waste their time designing parts for. However there are two companies that still produce headers for this motor, and some parts from other motors will work on yours, for example an Accord F22 adjustable cam gear will bolt right on.

You will occasionally find used performance parts on Ebay, and if you read some of the other posts you'll find some very creative solutions to the lack of performance parts available. Most people have their cams reground for some extra HP/TQ and swap on an SI cylinder head. A little porting in the head will also gain some HP and you can also bore the motor out to accept 1.6L D16A1 Integra pistons. Some people have even used motorcycle carburetors.

Do some research, you don't need a Edelbrock intake manifold to make power (there isn't one available anyway), people were modifying these cars long before aftermarket parts were available.