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I have a 1992 325i, and want to know if any one tried to use a test pipe,or gut the cat, :D , does anyone know where i can get one, and does it make a big difference in power. :driving
 

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not much performance , no cats or hollowed out are probably the last step in finishing the entire exhaust system. track pipes are a little better because the tubing is a larger diameter.but if you havent done everything else than do those first (intake, throttlebody, exhaust manifold, exhaust (or cat back))
 
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