[What do lvl 5's like?]

Depends on your car. Find your peak frequency and tune a lil bit lower

Well its a truck but I havent been able to get on a meter yet to find my peak.

[What do lvl 5's like?]

I know the dc lvl 5 can do some damage(it has in my truck). But I was wondering is there a certian herts these things love for like being in the lanes. I have a box tuned to 28hrz with the interchangeable ports and I just want one port that kills the numbers on the term lab. I just dont know what herts I should get it at. If anyone on here have some comments let me know thanks.

[156.1 TRUNK car.]

Good score fore out of the trunk. I will hopefully be past that when I do a blow thru on my truck.

[Best amp for a LVL 5 18?]

I would say go with something 3k to 4k. I am running an ap3k on mine right now and it doesnt get stinky or anything and it does some damage.