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If I still had my T100 I would have junked my 40 series FlowRestrictor muffler and gone back to an OE cat-back with my TRD headers.
If I needed a little more power at low end I would have then replaced just the muffler with a Gibson supper flow or a Magnaflow muffler.

I'm currently doing this with my Tundra. The JBA headers have been on for about a week.
The more I drive the more the ECU adjusts and the better the power gets.

I have a stainless steel Gibson super flow muffler ready to weld in place of my OE muffler just in case...


Well, I know that the 3.4's have more of a throaty sound already compared to the 3.0. But in your experiance, what is the throatiest-sounding muffler for these 6 Cylinders that you have heard?


I base my choice on performance but the sound froma Dynomax or Magnaflow is pretty throaty. The Gibson is more of a woosh sound.

I hope that helps.