If it is rebuilt, often the Napa units are likely reman'd by Cardone. Their Master cylinders, calipers etc are all cardone rebuilt as well. Cardone is generally hit or miss but is good with warantees if something does not work.

source: worked for napa for a few years. I never had a booster come back, but we also didnt sell a ton.

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth