Hello, so I just bought an 09’ Cayenne GTS 50k miles. Feels a bumping hesitation under light to moderate throttle. Under full acceleration it’s much less notiable if not gone all together. I changed all the spark plugs and coils. New air filter, and cleaned MAF sensors. Still same hesitation, like a bump bump bump. Feels like it can’t breathe good enough or maybe not getting enough fuel so I was thinking next I would change the fuel filter. Then I saw your post about the secondary cat bypass pipes. I was actually just going to order these for better sound but it sounds like it fixed your problem. Was your hesitation like what I’m describing?