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Designed for the Scion FR-S, Subaru BRZ, and Toyota GT86Straight design w/o catalyzer = Power up by the low exhaust pressure. Complied for Step-up tuning.We recommend having a total full straight exhaust tuning by having more power by changing the muffler and exhaust manifold and tune the sound with the front pipe. If the exhaust manifold is changed, the engine check light might be turn on for a certain combination. So the muffler + front pipe combination is an effective choice. The catalyzer-less straight pipe will have bad noise. So we have tested for frequency analysis as shown on the right graph, and tuned the soundwith 2 resonators.Note: Special order only!!