Flowmaster 40 Series Original Chambered Muffler – 2.50” Dual In / 2.50” Dual Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (425404)

The media could not be loaded. Super easy to install and sounds amazing for my 5.7 hemi!

Perfect amount of sound for me a 35 year old. Great idle, great sound when giving it just a little gas and on the highway. Left my resonator on and so I haven’t noticed any drone on the highway with the radio on just on low volume. Would buy again.

I always use these flowmaster on my V8's f150's...great sound and performance..

my old muffler was pretty restrictive and created back pressue in my exhaust system so I put this flowmaster 40 series muffler on my 03 dakota and it sounds awesome. this muffler is a little more aggressive than I thought it would be. the sound is really nice and it is a loud muffler. before I put my tailpipe back on there wasn't much of a difference in sound between this muffler and an open collector. but once I got my tailpipe back on it killed all of the resonance in the cab which is good because at first the drone in the cab was distressing and it was really loud. but now the sound level is perfect and this truck has a pretty mean exhaust note. out of luck this muffler actually lines up pretty close to the stock system. the only issue was it was a few inches too short and I had to put some extra piping in there to make up the difference and don't mind all of the foil tape, that was just to help keep it sealed until everything settled into place.

Good quality and easy to install. Love the way it sounds.

It is pretty loud in the cab between 1700 and 2000 rpm. Quiet enough when cruising over 60mph. Nice deep tone with no crackle or snap. It is shorter and the inlets are wider than the factory muffler, so a short length of shaped pipe is needed to be welded in to compensate. But overall it looks good and sounds good.

Good quality materials and construction.

I'm running a 454" powered '71 Corvette that has a high-performance factory cam, a high-rise Edelbrock intake, and a 3310-2 Holley carburetor. Up until now I had a set of stock mufflers on it and it would fall flat on it's face at around 3600 rpm. After installing these 40-Series Flowmasters it blasts up to it's 5500 rpm red line with no signs of exhaust restriction whatsoever. And as I'm also running a heavily-modified TH700R4 the amount of exhaust drone at cruising speeds is very small. For those of you who want a very decent street/strip muffler at an affordable price these 40-Series Flowmasters are the way to go. And with the free shipping they're even better.