A good alternator upgrade?

[chimpy]

Mechman Alternators, High Output Alternators, Built in the USA, Call 1-888-MECHMAN! the best in the business up to 370 amps available!

Great site, like the made in USA part.They have very powerful alternator options.

 

[Lindenwood]

Just to verify, there is no need to upgrade to 150+ Amp fuses / circuit breakers for these upgrades, correct? I am going to do the Big 3 at the same time I install the CS-144 (150A?), but the Big3 writeup only uses a 120A breaker because I believe he is still running the stock 105A alternator.

Thanks!