You barely need to trim any. I've had mine on for a week and still haven't done the trimming (hey, it's freezing cold here) I will trim them because they do rub a tiny bit once in a while, but it looks like John took off just about exactly as much as necessary. Which is good because I don't need to lose the mudflaps.

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Eric Konarske
'01 Solar Yellow XE 3 Pk. 4x4