Given the factory exhaust system on Alloytec powered Commodores are quite efficient from factory, it wouldn't be necessary to upgrade it to accommodate the CPR6 manifold or equivalent higher flowing intake manifold.
I was looking to upgrade my intake manifold on my 2005 VZ SV6 Commodore, but I was wondering is it necessary to upgrade my current exhaust system first? As of this moment my engine is still factory standard.
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