Hey guys i have 2 sets of nathans on my truck and I’ve read somewhere that you can drill out certain holes for more airflow. any feedback on doing so? a how-to would also be nice 
thanks
if nathan thought it was necessary they would have done this from the factory… dont ruin a good horn…
^ Blah blah blah.
OP - My K3LA was an absolute killer once drilled to 6mm. It really woke it up, and I loved it! Now that my K5HA has plenty of air running to, it’s even louder and much better sounding that the K3. If your looking for a louder, snappier, slap in the face punch, and even cleaner sounding… Drill to 6mm! Beware of more air consumption though…
Check it. Pics and comparison video here… The video really doesn’t so the mod justice.
http://www.mrenergyleds.com/store.php/products/new-nathan-airchime-k5la-raised-letters-