Hey all, I'm upgrading the stock exhaust on my SPI Mini to a new Maniflow and am having a hard time deciding whether to keep the catalytic converter or remove it.
Here in New Zealand we don't have any emissions regulations (the only rule is that the car can't blow black smoke - seriously), so the catalytic converter is optional.
I'm planning to go with a Stage II LCB manifold and a twin box side exit exhaust, either with or without the catalytic converter.
What are your thoughts? Would it perform better without the cat? Smell worse? Sound better or worse?