I have a Rear 7 speed 11-30 Shimano cassette. I'm about to change it and notice it's labeled "Interactive" on the cassette locking ring. The crankset is a 3-ring and it says "use IG chain only". However I replaced it with generic 6/7/8 chain and it seems to work and shift great.

Can I replace the rear sprocket to a Hyperglide etc? Do I have to stick with IG components only?