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firstly, Phase1 cars do not have downstream lambda sensors (after cat).
As for the aftermarket exhaust, it depends what you buy i spose. Phase 2 cars run fine with the downstream lambda left out in 'free-air'. Or even unplugged. Some cars will show an emissions light though.
firstly, Phase1 cars do not have downstream lambda sensors (after cat).
As for the aftermarket exhaust, it depends what you buy i spose. Phase 2 cars run fine with the downstream lambda left out in 'free-air'. Or even unplugged. Some cars will show an emissions light though.