Here are little tips for junk yards. Just because I spent a lot of time there.
1. Dedicate at least 5-6 hours of your time for a junker.
2. Find a junker that is good and take-off-yourself.
3. Look around in all sport compact car sections.. Which are Mazda, Honda, Ford..Chev...etc. Always look under the hood you may find interesting stuff there including cold air intakes (which can be used for ram-air, cold ar extenstions..etc.
Also always check for computer moduals and chips.
4. Use your imagination and tools. If you like something from one car. for example mx3 .....seats. and you not sure if they will fit. Take one off carry it to escort section and try to install it on one of the junker scorts.