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the N55 exhaust is a single canister design compared to the separate canisters on the N54 cars.
Here are some specs:
Material: stainless steel（SUS304）
Main pipe: φ60.5mm
Tail pipe: φ80mm / 4 tip
Installation: needs to cut factory exhaust and rear bumper OR install with 3D Design diffuser for M-Sport bumper
Control valve: control valve actuated with stock vacuum lines