My suggestion is always the Evo 8 BOV. It's 35 bucks, works and sounds great. For the rest of it, this is what I was told when I first started posting here....
Here are a few basic performance suggestions. If you already know them just ignore them
1. Datalogger [Increase boost safely]
2. Manul Boost controller ... [EBC if you can afford it.]
3. A real boost gauge...[The stock gauge is trash and will get you in trouble if you raise your boost.]
4. Gut pre cats [Faster Turbo spool]
5. Replace main cat with test pipe. [Faster Turbo spool]
6. [NGK BCP7ES] Copper plugs set at .030 [Prevent spark blow out]
7. MSD 8.5 mm wires [Prevent spark blow out]
8. K&N air intake
9. Pressure test your car and repair all boost leaks here is how to do it. [Please don't blow this one off it is very important and if you have leaks you are throwing H/P away.]
http://www.supercar-engineering.com/...T/IntPresTest/
10. Good quality down pipe. No ebay unless anoher memember has bought the same pipe and can recommend it. Most ebay DP's have fitment problems. [I like the 3sx down pipe]
11. The Y pipe won't help preformance at below 20PSI boost but it does make the engine look better.
12. Stock clutch in good condition should handle the above mods
13. The Above mods with very good driving can get you a 12.XX sec time slip..
14. And always remember that Stealth 316 Home is your best friend thanks to Jeff Lucius