So currently I'm looking to put a sub in my 350z, I came across a photo that shows how to make a sub box that fits perfect. It only provides about .64 cubic feet so finding a sub is hard, I found this skar sub (https://www.skaraudio.com/products/svr-8-inch-800-watt-max-power-car-subwoofer) which should be pretty good for the small size. However, I want to wire it up for 4ohms and finding an amp that provides 400rms at 4ohms has been hard. If anyone could help find a cheaper amp that could make this setup work that would be great, otherwise help me find another sub that works for small boxs. Thanks