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I would agree that at up to around 400 BHP there is no significant restriction on the airbox…I didn’t post it here but the same car on the same dyno with MHD V10 stage 2+ on 98 RON fuel did 399.1 BHP stock box and with the lid of ie no restriction it did 308.4 BHP on the same dyno same day..
So about 2% impact…earlier on a N20 heavily tuned E89 we found about a 4 BHP impact on a 300 BHP N20.
In Bonny Scotland we don;t have such high ambient temperatures but as I think I said I don’t like the DCI sound and the poor filtration performance doesn’t fill me with confidence for a ‘keeper’ car..
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