Why does it do this?

[268i]

Originally Posted by Exiwolfman

Honestly don't get why u would have problem with size of piping cos when running a CAI on my Yaris with a 3 inch piping that shrinks down to 2.25 at throttle body it all works fine ...same as my Sri home made intake ...I say u have an issue with ur sensor .
Anyhow I see u got new piping let us know how it goes.

sent from my S4 on Mars

I thought the same too. But I've tried 2 other maf sensors (one new and one from other car) and the same happens.
I probably won't have the time until later this month to sort another pipe out though..