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Your comments, feedback and suggestions: I can improve on the definition for brand product 'Grand Rock - SPU-4SK Single Stack Installation Kit for 4" Grand Rock Stacks': 4" Single Stack S-Pipe Kit This system is fabricated with heavy gauge commercial grade aluminized steel. Hardened steel canted and welded “ L” bracket, stainless heavy duty flex pipe and a sturdy clamping system that won't give. The 4" S Pipe is designed for smooth. unrestricted flow. Quality construction for lasting performance and ware.

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