Ever since I put on the Superchips box, my turbo makes this funny fluttering sound. I don't recall hearing it before. It happens when the turbo is spooling up, especially after a period of long coasting or engine braking. It seems like it's more pronounced when the engine is cold than hot.

I don't have a boost gauge. I think I'm going to order one, now that diesel manor has them on sale.

I saw a few really old threads about similar sounds, but there was no resolution to the problem. Any ideas?