Oh the screw didn't break. I lost just the silicon exhaust deflector, not the whole muffler. When I was back home, I took apart the muffler and dropped the baffle before noticing which way it pointed.

I want to know
1. if the deflector will affect the engine running or not. I've already replaced it, I'm just curious.
2. any suggestions about the fuel tank.
3. which way the baffle needs to be pointed if it matters.

Thanks.