Better shifting after new cat back exhaust and muffler? (1 Viewer)

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Fj moneypit

Cubic Zirconia Member
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I recently added a kamar spare tire carrier and had to cut off the exhaust resonator to make it fit. This made the exhaust "whistle" louder. I finally ended up changing muffler and cat back system to 2.5". No more
Whistle and I have noticed the car shifts up and down with more response. Used to take some effort to get it to downshift when needed, now it's effortless. What caused this? Anyone, anyone...bueller bueller?
 

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