From my point of view OP, No one will ever be able to get a very deep tone from a v6. I've tried many different setups and was only able to make it somewhat deep in lower RPMs. Now, most V6s sound bad because of rasp combined with the high pitched 6 cylinder sound. Like I stated before, you can deepen the sound but you need to quite your exhuast system to do so. If you haven't already try doing a 2nd cat delete and go from there. If you want it louder then you can buy some high Flow cats, unless you don't want to cut into the stock downpipes, then just go for the high flow cats. Here are a couple videos of my exhuast:
https://youtu.be/TmK3VMZUAds
https://youtu.be/kCpGmMBunpk
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