Meth isn't used by most people, and it's probable not working correctly. The fastest m90's aren't using meth!
Both cars are gen 5. You have headers and 3.6. SSAC headers aren't the best. I would guess the don't line up well with the exhaust ports.
You drive your car and I would guess the traction control pulls a lot of timing because it learns the driver.
Your mom probable doesn't have as heavy a foot a the traction control doesn't pull much timing.