guy with two soundrive sda 15s no walled below window line was doing 154.5 with one window open on a ford ranger. Sealed he lost more than 3 db though because of how his truck acoustics is. Two synergy 3500.1s half ohm.
Almost EVERY pickup I've seen gains huge with a window open. It is dramatic.
As to the question. If you are prepared for the money, work, weight, and the fact that it is permanent, go for it.
You will spend more than you think you will on wood, glue, screws, paint/carpet and other hardware and odds and ends that you haven't considered. I'd budget 1000$ for materials anyway.
It is a lot of weight, so if you don't have a vehicle that can hang with the extra weight or if being fast or fuel economy is important to you, might reconsider.
Lastly it's permanent. Don't plan to re-sell the vehicle later, and whatever you invest into it beyond wire and equipment won't transport out to your next vehicle (unlike just a box which may be able to go with you or even be sold). Oh, and if you get loud you'll start breaking stuff.
Beyond that is the obvious expenses of getting loud even if you stay below the window line. Electrical upgrades, wires/terminals/distro blocks won't be cheap and batteries/alternator will need to be replaced in 3-5 years or so. Big amps are expensive as are repairs when you break them.
Anyway, I'd recommend you go for it. You'll learn a lot and you're young enough to not feel physically broken after a 40+ hour install. Just be aware of what you're getting into and make sure you have the budget and determination to follow through and do everything right once you start.
You chose an expensive hobby. Learn early to DIY as much as possible, buy high quality now and every time, and work hard to earn money to keep trying to get louder.
