Anyone with dyno-tested power mods to a 4.8is?
As the title states, considering a Dinan airbox or some other manufacturer's but the claims of 15+ hp gains from that and other things is questionable to say the least.
Experiences? I wouldn't mind doing an S1 package or similar but only if it actually improves the vehicle... I'm looking for proof via dyno charts.
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12 X5 M - 06 X5 4.8iS - 03 X5 4.4i - 03 M5 - 02 X5 4.6is - 99 M3 Dinan S3 - 98 M3 - 92 850i-6 - 92 850i - 91 325ix - 89 M3 2.5 - and a few parts cars
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