A lot of useful information on blue headlights and Pep Boys under the search feature, above. Also, the site: http://lighting.mbz.org/tech/info/blue_bulbs/
has a great discussion on blue bulbs. If you don't want to do a search or go to the above site, the short version is:
1-Blue bulbs don't put out as much light, put out more glare and heat, don't last very long, and can possibly damage your wiring and/or reflector.
2-Pep Boys parts, policies, and information is listed by this forum membership generally as very poor. I believe the most commonly used phrase I have seen regarding PepBoys on this site is "PEP BOYS SUCKS".
Bulbs for your stock lights are cheap, Euro light replacements are expensive but put out a LOT more light. Hope this helps.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E