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Old 31-03-2008 | 01:28 PM
  #86  
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Mike Rainbird
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From: Norwich
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Put it this way, on my own car, when I was looking for ultimate response on the previous engine, I started to have it mapped with the Swedish plenum, but got to 5000rpm and switched back to the EECIV plenum, as all the power improvements were at the top end and I wanted response over power.

At the end of the day, it depends what you want to build the engine for - peak power? Then yes, it will give a 20bhp improvement at high rpm against a restrictive inlet (based on tests with a T4), but at the expense of a loss of low down response.

I wouldn't fit one on an engine that wasn't running a turbo that was T4 sized or bigger, as the standard items flow enough for the restriction / response compromises.

You have to make your choice, but the engine absolutely MUST be live mapped IMO for the flow differences.