Hi direwolf, When I met Darin and asked which mod he was going to do, he mentioned he only does the level 2 mods now a days. I honestly think it's loud enough, any louder it would be too much. And over time it hasn't gotten any louder, pretty much same as first day I had them on. The sound is actually quite deep (grumble type), I wish it was just a bit higher pitched.. You won't go wrong with Darin's mod.

Cheers,
Herb