If it's true 4-gauge, then absolutely. Considering the brand and the price, it probably is. Find some customer reviews online and see what they say. Most of the time people are quick to point out if a wire isn't its advertised size.
I wouldn't call stinger a crap brand.?
I don't have any particular brand loyalty, just look for ofc, true to size,strand count, flexibility, and cost. If it's cheap and fits your needs, that's all you need. Stinger, rf, knu, jl, welding cable, etc doesn't really matter if it's high quality run it.
Even for their OFC version, it is still over size compare to normal 4AWG that others offer... I got lightning Audio's 4AWG Strike series cable, but it is same size as Knu's 8AWG....
Anyway, back to the topic, JL HD900/5 is a high efficient amp, so any decent 4AWG amp kit should work. But not until the extend of what I said on the Lightning Audio cable's size...
No point going CCA, if you are worried about getting the better product, OFC is the only way to go. I've used Knu pretty exclusivelly in the past and never went wrong. This build around still a lot of knu, but went for Kicker Hyperflex for the main power wire (1/0). All distro blocks, fuses, 4awgs are Knu though. But OFC is OFC is OFC. Yeah, knu may be a bit bigger, but you won't notice a difference. However, bigger but CCA is a waste of space - it can't carry as much current. Google the amperage and you'll see that you'd be better off buying thinner OFC wire and have the same Ampere throughput. Doesn't matter which brand really. Heck, welding wire will work just as well, just won't be as flexible, but will have the same exact current carrying capacity. The jacket won't be as pretty, but that's what I used for my big 3 upgrade. Techflexed it and put split loom over that - can't see what the jacket looks like, wire are very well protected and my voltage doesn't drop below 14.1 (running a JL HD 750/1 and 600/4 - albeit very rarely, if ever, at full tilt).
Posting from work, so need this disclaimer:
"The views expressed here are mine and do not reflect the official opinion of my employer or the organization through which the Internet was accessed."