Did the delete by using a piece of acrylic from an old basketball backboard. Been argued over on so many forums about this mod, so I thought I might as well try it. Butt feel is that there is NO horsepower increase but definitely a better response in between gear changes. No CEL light so all seems good, need to go log some numbers.
Can't seem to hear that "chirp chirp" compressor surge sound. Maybe I'm not driving hard enough. Oh yeah, I drive a 2008 WRX sedan with AVO380 and top mount, forged internals.