V6 Exhaust help

[03TundraTRD]

I have a 03 V6 and I am having some trouble on how I should go about doing this. I know I want duals but do not want to lose any low end ,I my truck is slow enough already. So, my question is can I run an X pipe , and can I use a Y pipe. I also plan on using a Spintech dual muffler with a 2 1/4 in and maybe a 2'' out with TRD tips. If this is not a good setup please tell me which setup is good for a V6

[v8Toilet]

I would make the dual out the same size pipe as the two smaller pipes after the muffler. On the Tundra V8 they are 1-7/8" diameter.