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All Supersprint alternate connecting pipes are mandrel bent for maximum performance. The alternate pipe is designed to replace a resonator that is standard in that same position. This option will increase sound slightly and reduce overall system cost. The polished pipes are manufactured from 100% 304 stainless steel, while the black pipes are aluminized mild steel. Replaces factory catalytic converter. Legal only for racing vehicles which may never be used upon a highway. Not applicable or intended for street or highway use.