my tuner didn't care what physical status my injectors were, just brand/flow and what other power mods were on it as well as my car being mechanically sound...Very few injectors can be modified to increase the flow and still work correctly. Usually the spray patterns will be poor and their flow rates will be very mismatched after modification.
The only injectors we currently modify are the pink or blue top-feed Denso's and the yellow side-feeds that are used in the late model Subaru. These will typically flow within a few percent of one another after modification. We perform this operation using a lathe or mill to prevent injector damage. See our Subaru Mods page page for pricing.
https://witchhunter.com/injectorfaq1.php#do
so do it if you want, but getting a properly sized set of injectors would be best practice