95 XJ with new Bosch Injectors, Do I need Adj. Fuel Pressure Reg.??

I have to go and look back at the injector specs but if i remember the injectors are direct replacement for 87-95 xj's. Replaced all 6 with these bosch injectors and seem to run fine, maybe a little smoother too.

here is the link

http://cgi.ebay.com/ebaymotors/6-Bo...958QQitemZ270418467160QQptZRaceQ5fCarQ5fParts

Do i need an adjustable fuel pressure regulator? Or will one help with anything else like mpg or hp. I havent checked fuel pressure on the stock rail yet.