Not much reason to do that anymore. The Road Star relays are rated at 160 amps or so now. More than the starter would ever draw.
Still would like to do an Electrical Clinic at Celina one day.
Especially with current. So many people confuse where amps are used as supply number, verses used for a measurement of capacity.
The same amount of current (amps) flow through a relay rated at 200 amps as one rated at 800 amps
As long as your not pulling over 200 amps nothing changes. (Even then, the same amount of current will flow, but not for as long
A 5 amp switch does not draw more amps than a 50 amp switch
You can't use too big of a battery and "give it too many amps",
just as a bigger relay/switch will not "give it more amps"
(Do you care if you plug your 120 volt/10 amp drill in to a 15 amp or 20 amp outlet? It draws what it draws either way.)
And my favorite from the Facebook page, you can't jump with a car because the electricity it provides is "different".
Volts, amps, frequency do not matter, somehow it is still "different".