i would usualy do a search on this topic but..

would a extra fuel pump added inline after the stock pump help the stock pump to last longer, especialy if i was increasing the fuel pressure? or is it jsut a waste?

 

unless you have a WHOLE lot of power from your NA motor or you have a power adder, you don't need a second pump. as it is your stock pump pushes more fuel than you're using and it just gets sent back by the pressure regulator

 

Ukraine has it right. Unless you have a power adder you won't need it. If you feel the stock one might go anytime or it isn't "up to par" then I would go ahead and remove and replace! Maybe go aftermarket if its worth it to you in the long run. But the stock pumps are efficient pieces.