2010 Mitsubishi Lancer Sportback GTS (2.4L) CVT, 98k miles, No codes. 

I've been boggled by a noise that is entirely dependent on the position of the accelerator.

It doesn't happen parked or in neutral, and it independent of speed or RPM.

There's a certain accelerator position that makes a weak rattling or even tinkling noise that can be heard in the interior, sounding like it is in the engine compartment, centerline.

I can get it to disappear if I give a little less or little more acceleration.

I've checked the undercarriage for any loose heat shields, bolts, etc. with no results.

Modifications: Road Race Motorsports flywheel, Magnaflow cat-back exhaust, RPW 4-2-1 extractor (header), and K&N cold air intake. (Installed 2013/2014)