Yeah my brother has the newer Mac book and does have windows. We actually set up the FlashPro to it already. I was thinking about just buying the catalytic converter that looks like the one that Full Race uses and have it welded to the down pipe in the same location. I'm just curious if that will eliminate not only the rasp but the whistle associated with running cat less dps. The whistle sounds almost like a leak but there isn't any leaks. Surprisingly my wife wasn't bothered by the sound at all. She just hated how my '97 3.0 CL sounded with an intake. Like a UFO hum. I'm worried that the flex pipe is where the sound is coming from. Can anyone confirm that or am I trippin?