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4-2-1

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165
Just got a 4-2-1 header fitted on my ep3. I have got the map booked in for end of next month. Will it be ok to drive the car until then or best to leave parked till map day
 
Just a manifold shouldn't be enough to cause fuelling issues. I'd avoid driving it where possible and not thrash it until its mapped. Then it's game on!

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Backpressure and scavenging are a big thing with NA engines. I think changing the exhaust manifold (and/or decat) without mapping on a K20 is generally a bad idea as it can cause the engine to run lean.
 
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