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Hello I recently started to upgrade my 2017 Frontier SV 4.0L V6 4x4. I found out that using a lift/leveling kit (2.5" from rough country) causes the factory upper control arms to hit the coil bucket when going over small bumps. To fix this I swapped out the factory arms for SPC arms (#25540) and solved the clearance issue. Plus it has a grease port to grease the ball joint! I also installed the pedal commander (PDC45987058 ) to get rid of the annoying throttle lag. I really love the quick response I get from the pedal commander. I'm looking at cold air intakes K&N 63-6014 and possibly some exhaust modding as well. Anyone have any info on the best exhaust systems for performance, as well as keeping the sound low and aggressive without the ricey tones and drones?