Ah nope. Finding parts for a civic or s2000 is going to be 5 times easier than finding parts for a P5. As clean as your P5 is and as old as it is (12ish years old) I am sure there are 16 year old kids and general public (non car type people) have no clue that this car is not some new Mazda model for 2016. On the other hand almost everyone can tell an old civic or accord when they see one. There was just too many of them. Our P5s where here in the states for like 2 years. No one knows about them, and almost no one has mod parts for them. Why would they? Including my daily P5 all the P5s I see around here are rotted out s*** boxes.
s***, my cam gears came from Australia and Montana I think. My ECU came from Canada, and my header originally who the hell knows! I live in Chicago and there are plenty of mod shops around, and they have nothing but Honda, Subaru, and Mitsubishi parts in stock. If you tell them you have a P5 they have no idea what a P5 is. Its a clear PITA to find "bolt on parts" for a P5.
Modding the P5 has always been a uphill struggle. Especially N/A. And as the years keep ticking by the harder it will be. So man take the compliment and sit back and soak it in cause your car is at the top man. If you need inspiration, OK I can see it. But for comparison... you need to find something as rare as the P5.
Nothing against Honda, they make a great car. But.. **** EM.