A_Sawyer704

I'm thinking about going with a 40 series on my 2014 4x4 V8 5.0 STX model for the muffler and dual exhausts does that sound good? I want it loud but still pass NC state inspection! Any ideas suggestions or comments thanks guys

blackhawk2002

True dual 40 series FM Full throttle take off. I will pass inspection here Texas.

blackhawk2002

50-60 mph drive by

blackhawk2002

Normal take off

terraformer

Sounds great, but too obnoxious IMO. Don't get me wrong, it sounds fantastic, and I love the sound of my V8. Maybe it's getting older - probably is, really - but I find that the attention-grabbing properties associated with a loud exhaust are not worth it. If you love attention, then by all means, but most of the people around you aren't so appreciative. If you care about that sort of thing.

uzikaduzi

I don't know if this matters to you, but since Flowmasters are a baffled design, it only affects sound and does not increase flow

shannonC

I had a 40 series on my 14 screw and it lasted 2 days before I had my stock muffler put back on. That was with retaining the resonator. The exhaust drone at 70mph was ridiculous. The stock muffler flows pretty decent anyway.

blackhawk2002

Hey everyone has there opinion. I enjoy it very much.

FlowmasterMufflers

One of the advantages of Flowmaster's chambered muffler technology vs. a comparably sized ‘straight through’ muffler is the interior volume that each muffler can handle. Think of it like this- Take a 2.5” inlet/outlet ‘straight through’ muffler (which is just the volume of the length and inner diameter of the tubing passing through the muffler) and fill it with water and then dump it into a measuring cup. Then, do the same thing with a comparably sized 2.5” inlet/outlet Flowmaster muffler. The Flowmaster muffler would hold considerably more water than the ‘straight through’ 2.5” piece of tubing. This added volume allows less resistance (more volume for the exhaust inside the muffler) and a ‘relief’ vs. the same sized tubing of a straight through design. Another benefit is, as the exhaust splits and travels around the deflector (the V shaped baffle) and joins back together behind the deflector to exit through the collector, it does two things. First, it creates an area of low pressure behind the deflector resulting in a “pulling/scavenging” effect and helps pull the following pulses through the exhaust. Second, the deflector acts as a one way check valve and eliminates the sound waves and exhaust from reversing and running back up the pipes to the engine, messing with the tuning. The end result of this added scavenging is a cleaner burn in the combustion chamber because you're affectively reducing the contamination (unburnt gases left in the combustion chamber) which = more TQ and more power.

uzikaduzi

I've owned a few of your mufflers and they make a great sound. while your logic seems to make sense, the performance community doesn't seem to accept it and in the few flow charts i've seen where they compare actual CMF flow at the outlet, (with mufflers of the same inlet size) your products have been quite lower performing than the straight through designed options. I'm sure i could find a few to post, if you'd like a chance to refute their claims. in fairness, i doubt the stock fuel trims are adequate to allow much, if any power gains from any exhaust system.