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SUPER MANIFOLD with CATALYZER R-SPEC is more advanced and upgraded product of SUPER MANIFOLD with CATALYZER GT-SPEC. By removal of the catalyzer at the exhaust manifold, we could have a substantial reduction of the exhaust pressure. * Only used with stock muffler will be compliant for Japanese safety standard. Features Cautions * Only for MT * Only used with stock muffler will be compliant for Japanese safety standard.
We also redesigned layout of front pipe with HKS metal catalyzer (this product comes with front pipe that passed Japan exhaust regulation).