New improved design with more installation clearance and a larger resonator section (less noise). These pipes replace your factory catalytic converters, letting all the exhaust pass through freely, but not the noise. Plain test pipes offer the highest level of flow, but often result in a "raspy" exhaust note between 3-4k rpm. Test pipes have always been high on the "bang for the buck" list, but the louder exhaust ote can be too aggressive for some people. So we now offer a full stainless straight through converter replacement, but with a stainless exhaust resonator welded in-line. This gives an equal amount of flow, but without the raspiness. The exhaust note will only be slightly louder, and have a slightly deeper tone. Catalytic converters are the biggest "choke" point in the exhaust. These pipes have shown a 5-10hp increase at the wheels on factory 350z's. Our CARB legal converters will show almost equal gains, but straight throughs are a MUST for any FI application. On Turbocharged cars (example Greddy) we consistently see gains of 25-35 hp !! with faster spool times.
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