What's the average amount of modifications the stock injectors can safely support without needing to upgrade? My reason for asking is, I will eventually be doing a H/C Combo and would like to know if I should include the price of new injectors into my budget.
Sorry for the Hijack, O.P.

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1999 Firebird Formula, M6 w/non stock Hurst Short-Throw, Jet Hot LT's & Catted Y-Pipe, SLP Loudmouth, 160 Thermostat, SLP Airlid w/Smooth Bellows, SLP Subframe Connectors, Spohn Adj. T/A-Underbody Brace w/Driveshaft Loop.