So I've looked all over and yes I used the search option on here, but I just got a 2012 Mazda 3 with the Skyactiv engine and was wondering if it was possible to put aftermarket headers on it?
The skyactiv has a 4-2-1 header from the factory. Its a special design that is required for the engine to run properly with its high compression ratio and not knock. If you remove it then you risk damaging the engine.
If you want to mod for power then I would suggest you trade it in for a non-Skyactiv model.
the 4-2-1 IIRC went into the CX5s, but I am telling you as fact, did not make it into the 3 due to space constraints.
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