Start with some boost control. Get a fish tank valve from Walmart, about 75 cents. You can use this to raise the boost to about 15psi safely without detonation running super. If you are careful, you can disconnect the knock sensor which retards timing but it is easy to blow another head gasket if you detonate. The next thing is a good air filter, preferably a K&N cone, part number RE-0390, which replaces that whole airbox assembly. After that, grab an intercooler and get a better exhaust and you will be rockin'.
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George DiGregorio
86 TurboCoupe 14.3@93mph
