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I don't know why the LGX would sound so much better than the LFX. They are pretty much the same engine architecture, 3.6L D.I. DOHC 60* V6.
Are you sure you're not comparing an LGX with the NPP exhaust option to an LFX without NPP? I think my non NPP LFX sounds great. No, it's not some big honking burbling V8, but I do like the exotic car like sound it emits at mid to high revs.
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