i got a 02 rsx type s muffler i want to put it on my car, i already have a 2.25 catback with straight through muffler now, will i lose any power with this muffler since it is chambered or does it flow good ? setup is gsr motor type r header skunk2 manifold

 

Don't worry about losing power or gaining power. Most muffler/exhaust gives similar results. Also, you can barley feel any power difference. Muffler/exhaust plays a bigger role when it comes to n/a or turbo builds. Base on your setup, it shouldn't matter much since you already have a 2.25 inch catback. That's the most you need for now.