I did very little to turn this into a monster. First off, it's a fantastic vintage P-bass right out the box, if that's what you're after. I added a Hipshot bridge, CTS pots + orange drop cap, and Quarter Pounder pickups. I also treated the neck with Tru-oil and lined the insides with copper. Final result is an A+, 10/10 beast! This is the best instrument I've ever owned and I look forward to buying more Sires in the future.