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Cat-back - Dual Rear or Side Exit - American Thunder - Moderate Sound

American Thunder Kit

PART# 817650

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Flowmaster's American Thunder cat-back exhaust system for the 2007-2009 Toyota Tundra is perfect for the person looking for moderate sound levels with all of the performance benefits that you would expect from Flowmaster. This bolt-on DOR/DOS (Dual Out Rear / Dual Out Side) emissions-legal system for the 4.7L engine features a 50 Series Big Block muffler, 2.50 in. mandrel bent stainless steel tailpipes, and 3.00 in. polished stainless steel tips. This system fits all wheelbases and only fits 2009 models built before 8/2008. The exhaust system in manufactured in the USA and is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.


  • Lifetime Limited Warranty
  • Patented Delta Flow Technology
  • Dyno Tuned For Maximum Performance
  • Stainless Steel Construction


Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear / Dual Out Side
Heat ShieldNo
Inlet Diameter (in)2.5
MaterialStainless Steel
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series50 Series Big Block
Outlet Diameter (in)2.5
Product TypeExhaust Systems / Kits
Single DualDual
Sound LevelModerate Sound
System TypeCat-back
Tip Diameter (in)3
Tip Length (in)12
Tip Quantity2
Tubing Diameter (in)2.5
Part Number817650

Tech Resources

Fits 2007 to 2009 Toyota Tundra with a 4.7L V8 engine. Only fits 2009 models built before 08/2008



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