Show your engine bay

I agree with the above list and will add some more.

1. worm type hose clamps
2. huge yellow coils
3. big MSD boxes(in the engine comp on a street car...race car is fine)
4. plug wires that are a completely different color than anything else on the car.
5. rusty headers or exhaust manifolds
6. parts painted to look like zinc dichromate(yellow zinc)...it's not hard or expensive to have them re-plated correctly.

There are more but I think I've alienated enough people so far.