So finally decided between the Type R's and JL w3v3's im going to go with the JL's. But i don't want to keep the sealed box i got now so i want to go vented and want these sub's to really wang so what's the best spec's for a box for these sub's someone please help me out. They will be going in a 1989 mark vii and powered by a digital audio 1800x mono block amp.