BassPlayer.com is featuring a great article on the effects of changing your pickups!
Here's an excerpt:
"One simple way to profoundly affect the basic character of your instrument is to swap out the pickups— a mod that can often be carried out with no alteration to the bass itself. But to attain your version of sonic nirvana, it helps to understand what factors determine a pickup’s tone, and how a pickup interacts with your instrument."
Read the entire article HERE.