I believe you are right sir.....they provide more fuel if you need it.....unless you're making a lot of horsepower and need more fuel it's pointless to do
yes, it is pretty much a bolt in affair. It flows more than the standard GT pumps, its the returnless equivalent to a Walbro 255lph. should be enough to support a procharged GT or the like up to ~450hp, give or take depending on the rest of your support mods.