[FRSjeff]

I'm almost sure this is the problem I'm having. I have a manual and this sound occurs similar to the other post you referenced. Here's what I know for sure --> it only does it when the engine is totally warmed up; it started doing it after I got the ecu replaced due to the cel issue; after mentioning it to the dealership they replaced the fuel pump and this did not fix the issue (in fact, I have louder crickets now, but, that's a totally different issue). It does it on different brands of gas (all 91 octane which is all we have for premium in California).

I think (but I'm a total novice at this stuff) it has something to do with the mapping of the ecu.

I really hate this noise! I'm going to take it to the dealership again and hope they can fix it!