This has been very time consuming and a huge learning curve.
We've tackle drone many times in the past, but not this low down on a 4 Cylinder.
Most of the time it's been around 4-5K rpms and has been easier to tune out.
We've put a lot of hours into this testing and I hope it gives you some ideas too.
Check out the LHT Store
Hoodies back in stock
https://www.lhtperformance.com/product-page/lht-s2000-hoodie
https://www.lhtperformance.com/product-page/girls-lht-s2000-hoodie-dress