I only have an aftermarket mid section/muffler, removed rear resonator, and then deleted the rear cats and raised the crossover section so I could mount skid plates higher.
I immediately noticed more drone in town with the removed cats.
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
I would highly recommend getting rid of the restrictive stock y pipe. Especially since you already have the Doug Thorley headers. In addition to the DT y pipe coming out, take a look at the URD Y pipe if you haven’t done so already. Highly recommend it.