Re: Planning a system, big 3 done, will I still need a bigger/another alt?
You can get a 145 amp large case GM AD244 alt used on ebay for around $50-75. You want the 2003-2005 KG3 RPO code alts. You will like the extra 40 amps of current.
Alternator for A 03 04 Tahoe 145 Amp Opt KG3 | eBay
Your stock belt and tensioner may have enough slack, if not you just purchase a slightly longer belt.
I was running 2 of these with 4 deka batteries on 4 bb2400s and never dropping below 12 volts.
95 Sonoma Ext Cab 4.3L 5spd, Dual alts Tenney 270 amp alternator and 240 amp H.O.alts, 4 DEKA AGM batteries
Pioneer deh8400 rsd250.2 powering Infinity Kappa60.5 comps and Morel coaxials
7.2 cube net wall 2 crossfire XSv215s and 4 bb2400.1s.
Daily Driver: 1995 Buick Park Avenue "leather couch on wheels"
JVC KD-HDR60 Aura RPM2300 on Opti5.1 comps and Planet Audio zr300.4 bridged on Morel Ultimo 6X9's
REFS: AMPJUNKIELIKEME, SERJR711, ZEUSILICIOUS