fuel injector replacement benefits

[David.Payne at brinksinc.com]

Car is an '89 90 quattro 10v with about 160k on the clock.
I'm going to replace all of the vacuum hoses and fittings etc because I
know I have some vacuum leaks in the intake boot and hoses.  I know that
there is a possibility that I may have vacuum leaks around the injectors,
so I'm curious what gains I might realize if I changed the injectors and
associated hardware as well.  The vacuum boots and hoses will cost about
$150, if I do the injectors as well, that will add about $250.
Thanks for your input.