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I've got castles downpipes and install the secondary cats for mot and the car passes, although a good drive before the mot is recommended.
I'd remove the downpipes because the car is much better for it, it's sounds great and not much louder, temperatures are reduced, throttle response is great and it can pass mot without them.
I had stock tune with full catless super sprint exhaust setup, evolve intercooler, evolutionworks charge pipe and afe intake, car produced 360bhp at the wheels. Really impressive I thought. There was no afr issues on the stock tune-in fact they were perfectly in line with the stock setup-with those modifications so you could install them without a tune and gain 25/30 bhp.
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