Hey I was wondering if I up my alternator to a 200amp over the stock 136 amp what do I have to change or do I have to change anything at all?

 

First the fuse in the PDC that's 140A , recommend to change the wiring from the alternator to the PDC or a second PDC for additional loads.
Just that the alternator can deliver more amps does not mean that your wiring can distribute them.

I think that the 136A is more than enough for most applications, but if you know you need more you will also have to include the wiring to support your loads.

 

First off, you need to know if the alternator you're looking at has the stock pulley size because its not uncommon to achieve higher amps by spinning the rotor faster. If the pulley is not the same as OEM then you'll have to get a different size serpentine belt to fit.
Also, 200 amp is pushing the limits and you might have to increase the size of the lead wire.
Just letting you know but Nations carries a 180 amp with the stock pulley, 12 diodes, and hairpin windings.
The goal is to make adequate amperage during low RPM situations and also produce a clean sin wave. Alternators that create too much AC can be damaging to sensitive electronics...