.... a ricer, which you obviously are, has nothing to do with the car itself. It is the driver. You obviously know nothing about cars and want yours to be fast and loud because you think that is cool. There are a lot of people like you, they go to car shows and star in movies like the fast and furious. To do modifications that make the car look "cool" aka having a giant wing on the back that not only looks terrible but has no areodynamic value, or a big body kit that only takes away from your areodynamics. More examples include gutting out your entire car for weight savings, only to fill it up with a big heavy stereo because loud music is cool. Or stickers all over your car to mimic drivers that are forced to place the stickers on their car because they are sponsored. Even better yet to place stickers on your car of companies who's parts you don't even have on your car. Then there are decals....what used to be innocent and original is now terrible and common. The racing community is moving far away from these mods because of people who buy a cheap slow car, do nothing to it to really increase performance, and then put all of these stupid pointless consmetic upgrades on it. The real fast cars are loud because they have to be for performance, not by choice.

Yes, a test pipe will give you more hp because it will reduce your backpressure but it would be minimal, and you would lose some torque in doing so, and if you are staying na then you want some backpressure.

As for doing it because you want it to be more loud. That is stupid, the whole idea of the muffler is to muffle your loud ass fucking engine. You are a ricer, accept it. It is frowned upon by most on tr because most ricers are beginners. and because they think of tacky designs... but mainly because they have nothing good to contribute to the community. Except for their wealth of course, which is why you will get a lot of mechanics telling you to just come and see them, so they can do what you want and make some money for it, then of course when you learn a little bit and you taste drasticly changes you will pay them again to remove what they did.

EDIT: I think carbon fiber hoods unpainted and in general are rice. But I'm an extreme on that level.