if its good 4ga, you should be fine, but not being able to see the wire i cant say if that kit will work. ive been in the car audio world for 14 years and have seen some "4ga" wire that the actual wire inside was as small as an 8ga. when it comes to wire, you get what you pay for and your main power wire is something you dont want to skimp on. i wouldnt risk burning my car down to save a few buck on a wire kit.