Re: new here major question about my l7 and punch amp`
You have a dual 4-ohm sub - that means you can either wire it in series for 8ohms, or parallel for 2ohms. That amplifier is only 4ohm stable when it's bridged, meaning you're better off running it stereo like you are right now - one voice coil per channel. However, that amp only puts out 100w per channel (100w x 2) - that is not nearly enough power to drive an L7, ESPECIALLY in a sealed box. You're going to want to get a new amp, one that can at least match the RMS rating of the sub (that sub can handle much more, though).
When it comes to building a ported box, you can't simply add a port tube to a box and call it a done deal. You're going to need to build a whole new box and tune it to Kicker's specs since it seems this is your first time messing with car audio, and going outside of the manufacturers specs is unadvisable if you don't know what you're doing.
Edit: I just now read that you're driving an 8" L7. You'll still need a stronger amp, but you're not too far off.
Bought from: BassAddictJ, TBH1, Whitedragon551, Parker G, Ciaonzo, James Bang, GetLikeMe, Here-I-Come
Sold to: Slim2fattycake, Bigbangtheory, Safe_Cracker, Burton6431