  Compressor Bypass Valves
1995-1999 turbo Eclipses and Talons have a plastic compressor bypass valve that doesn't even have a decent valve seat. The result is a valve that leaks precious turbo boost, limiting performance. Replacing the factory valve with an upgrade part is one of the easiest and most dramatic improvements you can make. Even first-generation (90-94) Eclipse/Talon/Laser cars can benefit from a CBV upgrade, if you want to push more than 20psi through the motor.
If you're looking for the street scene "PSSSSHHHHHHT!" noise, you can go with an open-to-atmosphere Blow-Off Valve. There are compromises to this setup; since the blown-off air has already been metered, the car may run a bit rough between shifts as the fuel mixture is momentarily incorrect. But you'll have a fun time scaring pedestrians with your loud BOV. For some, it's worth it.
Note that Mach V also carries intercooler pipe upgrades, sold with and without upgrade compressor bypass valves.
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