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Just installed a Stillen Cat Back Exhaust on the Q40. Very easy install if you are thinking of DIY'ing. I only put jack stands on the back. I did have to jack each side after to torque the front joints.I was surprised how much better idle sounded. I was only expecting higher rpm sound improvements. Old OEM exhaust
If you are planning on installing a CBE, a 3/8' torque wrench would be helpful. The head on my 1/2' Torque wrench made it tough to get on some of the bolts.
