No power loss, just a fluttering noise constant between around 3500-5000rpm!? 2010s3 with revo intake. Apr hpfp. I fitted a gfb dv+ and made no difference. Is this normal?
Now running Revo intake
Tried most intakes now and there's not a massive difference in any.
Although the Revo one doesn't lose the low down torque that the others do.