Yes, the SN's 3G alt is 130 amps. The foxes were 65 amper units, +/- 10 amps over the run of years. An SN cobra should have the same alternator as an SN GT.
The stock units are known for not putting out as many amps as they should, once they get old. So if you think you have 130 amps, you might not.
Upgrading is always good, ya know?
Good luck.