Project Toyota Tundra Part 5: Testing TRD’s Warranty Friendly Exhaust System

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The TRD exhaust is very complete.  It comes with this new OEM style heat shield to protect the floor and a new hanger for the left side exhaust.

The next logical thing for us to add to our truck was TRD’s exhaust system.  Our exhaust arrived in two large boxes that were pretty heavy; we guess it’s a big exhaust for a big truck.  The TRD system is a true dual exhaust system using two exhaust pipes to replace the single factory pipe.  One exhaust exits on either side of the truck by the rear wheels angled outward, lest you set your trailer on fire. (Don’t ask us how we know about this…).

The super low restriction perforated core mufflers give the exhaust flow a straight shot out.  These are very low back pressure.  You can see right through them end to end.

The stock factory exhaust, funnels the engine’s entire output into a single pipe going into a huge muffler.  Presumably this muffler must be pretty restrictive as the Tundra literally makes zero noise out the tailpipe.  In typical Toyota fashion, the Tundra is one of the quietest vehicles we have ever owned.

The hangers are all stainless steel and are headed like stock so they won’t fall out of the hanger.

The TRD system is a true cat back as it bolts in right after the factory cats.  Instead of going into one tube at this point, the TRD system stay as a true dual exhaust from here on out.  The smooth mandrel bent tubing is 100% rust resistant stainless steel, high quality stuff.  From the cats, the tubes feed into twin straight though perforated core stainless mufflers.  Perforated core mufflers are the lowest backpressure muffler of any type.

Nicely polished stainless steel tips.

With a perforated core muffler, there are no baffles, only a perforated tube surrounded by a packing of stainless wool and fiberglass batting.  Sound waves pass through the holes in the tube and are absorbed by the batting.  The exhaust gas can pass though unimpeded.  Thus a peforated core muffler has about the same backpressure as a smooth tube with no muffler!  The only drawback is that a peforated core muffler tends to be louder.

The new hanger is made of stainless and bolts to the frame rail using existing bolt holes.  No drilling or messing around needed.