I had a Flipper Fidelity kit in my T2, and I gotta say it didn't do all that much.. new speakers are good, but they're only as good as the sound samples you feed into them (T2 is pretty compressed). On the flip side, I put a FF kit into STTNG and it kicked ass!
I'd say anything pre-DCS, don't waste your time + money.
I'd say anything pre-DCS, don't waste your time + money.