pika writes “What do people think about the metal mouthpieces with spoilers? How much louder do they make you sound(tener sax) because i was thinking about getting one for marching band. Email me if you know anything.”
First off, we don’t “email me if you know anything”. That also goes for people who “please email your XXXX arrangement”. You won’t believe how many times a week I get that. It is so Middle School.
Back to your question. A baffle indeed makes your mouthpiece louder. I think that is what you mean by “spoiler”. It would make a metal mouthpiece louder obviously. However, it does change the quality of the tone you get out of the mouthpiece. I tried Power Tone Baffles briefly on alto, and did not care for them. I got more volume, but the tone just didn’t sound good.
There is another thing you could try. If you put some paper underneath the reed (where the reed and mouthpiece contact), that will give you a little more buzz and power.