headers and full exhaust

Does anyone know if there's anyone that makes a complete kit for a 2014 taco SR5 4X4 with a 4L from the headers to the exhaust tips that gives good gains in low end torque, and sounds loud and deep ( more like a V8 and not a winey V6) I have some JBL headers given to me so I could use them its just I don't heat to much positive about them. Magna flow, MBRP, Flow master are the brands im looking at or do I need to custom make something? I want the deep loud aggressive sound but can I even get that out of a 4L V6?
A Kit with all the parts from the headers complete with everything ( hardware, gaskets, clamps, just bolt it in) would be nice. Does anything exist like that?

 

I don't believe there is a full kit. This thread shows different NA dyno graphs. http://www.tacomaworld.com/forum/performance-tuning/229882-n-power-gains-dynos-w-mods-6.html

 

open it up too much and say goodbye to that low end grunt

 

I went with a custom system so I could chose the components. My 4 banger sounds like this with a LCE long tube header a Flowmaster Series 50 Delta flow muffler and a small 2.25" mandrel bent tailpipe so as not to lose the low end torque.

https://www.youtube.com/watch?v=cMv-imsBZLI

https://www.youtube.com/watch?v=cSKp-7XJ2qQ

 

URD is the only one I know of going from front to back, but their systems are more optimized for high-end breathing, then low-end scavenging.