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Straight design without catalyzer = Power Up, because of the low exhaust pressure.
(Complied for Step-up tuning.)
The main part for the high output is the exhaust manifold shown on the right graph.
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.
Straight design and still clear sound
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 sound with 2 resonators.