I think I have the same problem on my 340.
I tried with and without the piggyback (tried dinantronics and activ8).
Hold at 4000rpm then floor it. Have tried in 1st and 2nd gear.
Can feels like it's blowing thru a straw then unleashes once it hits 5500rpm or so.
I have a vrsf catted and noticed this immediately after.
How can I diagnose and what's the remedy?
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