Quote:
Originally Posted by bnekic
Exhaust and intakes are no big deal.
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actually, an intake IS a big deal. If it truly is doing its job (questionable claim here)....it can lead to lean conditions on a turbo motor with no tune. Now, the BMW ECU should be able to compensate and add more fuel but if not, you'll get early detonation (pinging) which can cause premature wear or engine failure.
On other turbo four's (Subaru's for example), it's not recommended to add an intake without also doing a tune at the same time.