Depending on which 50 series you use. Most of the 50's are just as loud as a 40 series, just have a tuning chamber that is supposed to reduce drone. It does to a point. I haven't heard them on a GXP or a Grand Prix but have ran them on a couple of different 5.3L truck's. Still overly loud to me at least. The last truck I put one on has cat's deleted and a single out flowmaster delta 50. The delta 50 suv is a touch quieter.
Everyone has they're own personal preference when it comes to exhaust. Loud doesn't always sound good, the way the exhaust is set-up in these car's the exhaust note is not the same.
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