[QUOTE=Big Bill;226930]Can this blocking mod be done with the standard exhaust?/QUOTE]

Yes. You will be fine.

The only thing to consider is that blocking the AIS will reduce exhaust temperatures from a cold start (where the valve is open all the time) so the catalyst doesn't get up to temperature quick enough to work properly and also unburnt fuel will (over time) potentially damage the catalyst. In other words emissions will be affected, but as they are not tested on the UK MOT, it doesn't matter. Engine performance and fuel economy will not be altered.

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