I assume by the Kopec system you are referring to 1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Bd3 I generally meet this with the recommendation from Chris Ward's Winning with the Sicilian Dragon 2 which runs 4...Nc6 5. h3 (5. Bc2?! Bg4!=) d5! with a perfectly good game for black. Another interesting idea is 4...b6 5. h3 (again, 5. Bc2?! Bg4!) 5...Bb7 which should be fine for Black. Hope that helps.

If this is indeed the opening you are referring to (I have also heard lines in the Open Sicilian called the "Kopec System") let me know so I can move this topic to the "Anti-Sicilians" section, where it truly belongs