Review on Flowmaster 8524553 Super Muffler 409S by David Burns

Almost perfect fit for my 2017 5.7 Tundra Crewmax, just had to add a few inches of piping to compensate for the shorter muffler. It sounds great, slightly louder than the original while driving, but when you press it you notice it immediately. A very light drone cruising at about 60 km / h does not bother anything and you can still have a normal conversation. There's no noticeable loss of torque at low revs, but you can tell the engine breathes better. This is exactly what I was looking for. The only other Flowmaster that could have a straight seat would be the Super 44, but I didn't want it to be as loud or buzzy. It took the muffler shop less than 30 minutes to weld them to the factory pipes.