Weird Noise From Engine...???

[RiceRocketDSM02]

Hey guys I have a wierd noise coming from the engine. On deceleration roughly around 2000rpm I'll get a chime coming from my engine. Kind of like if you were to hit metal to a wine glass. This noise is only gettin louder. This happened to my first gen gst. It was bone stock with a welded muffler. Now I have a second gen gst. Its slightly modded but i dont think thats the problem if it happened to my stock first gen. If you guys could give me some help that'd be great...thanks

 

[project15]

im pretty sure i have that too. it's like right after you let off the gas pedal and the vaccuum hits around -15. I only hear it with the radio off and the top/windows up. I don't worry about it since mine's not getting louder.

 

[RiceRocketDSM02]

im pretty sure i have that too. it's like right after you let off the gas pedal and the vaccuum hits around -15. I only hear it with the radio off and the top/windows up. I don't worry about it since mine's not getting louder.

I was just wondering what was actually making the noise... and how could I fix the problem because the noise is kind of annoying.