I'm new to Sundown equipment, and haven't owned any before. I've read so many wonderful reviews and posts by Jacob, I'm confident that the product will exceed my expectations. However, I have concerns that this will be *too big* (if that's possible). I'm considering the SAX-100.4 for my daily driver (with future uses in mind, of course). This would run my entire system, stereo for front component set (probably high-passed @ 80-100hz), and bridged rear to the sub (low-passed @ 80-100hz). The sub I have probably would hit max excursion before full output of this amp, so gain would probably be set low on the bridged channel, and low on the fronts to match. My prior experience would tell me that this wattage of amp should only draw around 25 amps in daily driver use, but I see this beast has 90 AMPS worth of onboard fuses. My stock alternator is only 90 amps, so I'm concerned that buying this would either overburden my electrical system or I would cause damage to the amp by not having enough current available. My car currently only has 8ga power running to the amp location, haven't done any electrical upgrades. Any feedback or suggestions? I don't want to get into a major upgrade issue with this car, as it's nearly 10 years old. I do want to be able to keep the amp for my next car though...

You will not draw 90 amps from the amp with your setup - so you should be good to go.

You should be fine. I have ~1000 watts RMS on my stock electrical with a 90 amp alternator and I get almost no dimming. Voltage never goes under 13.3 volts.