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You first have to understand the function of stacks.
Stacks are put on larger rigs, not for looks, but so that the exhaust doesn't get on the trailer and is also away from other vehicles.
People began putting stacks on smaller rigs for the look, basically to imitate the appearance of the larger rigs. This is usually done strictly for cosmetics and sound, but properly set up, it can do the same function as a larger rig.
On a gas vehicle, it is just looks and maybe sound, since there is no diesel exhaust.
So there are not a lot of upsides. As far as downsides? Well now you have a hole in your bed. You also have a pipe sticking up through your bed. You will get exhaust drone inside the cab. People can vandalize your truck by dropping junk down there. You will get laughed at.
At the end of the day, its your truck, and if you like the look of stacks, go or it. But from a functional or practical standpoint, you money is best spent elsewhere.
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