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, Model-P pickups and CTS pots + Mallory cap, treated the neck with Tru-oil and lined with copper. Final result is an A+, 10/10 beast! This instrument is as consistent and reliable as it gets, especially for the price, and I look forward to buying more Sires in the future.