** UPDATE **
See post #18 to see how this ends and my comparison.

I have a V8 '07. I currently have the Gibson Catback installed. No resonators. The sleeved attachment w/ U bracket system provided by Gibson doesn't work when off-roading (everything keeps coming apart). So I was going to have the sleeved pieces welded together tomorrow.

But I'm not exactly pleased with the Gibson. In low idle/RPMs, it sounds great. When traveling at highway speeds, the drone is very tolerable. My problem is when I hit high RPMs, the sound is replaced by a horrible WOOSH sound. So I want something that handles high RPMs better.

Talked with the muffler shop today that will be doing the work. They carry the FlowMaster 40, 50, and 70 series mufflers. I realize the 70 would be too quiet, so it is not in consideration.

So my question is this: I realize the 40 is louder than the Gibson. What about the 50? Louder or quieter than the Gibson?

Yes, yes, yes...I've searched. Those of you who want to direct me to LMGTFY, don't bother. I've watched many videos to try to answer my question, but to no avail. People use different cameras with a wide range of audio capture electronics, placed at different distances, in different wind conditions, etc...so a true comparison cannot be achieved via online listening. A ballpark estimate can, but not a solid conclusion.

I am hoping someone on here has actually heard these in-person...live...and noted the difference.

I will record the Gibson tonight using HD DSLR with external mic, and whatever I end up with tomorrow using same equipment in same position. Thus, I can provide benefit to someone in the future. For now, I need to benefit.

I'm sure you've gone on flowmasters website ? My buck nickel says 50 or 70 !! I've got the 70 on my v6 & its pretty aggressive sounding , but that said the delta 50 is for the big suvs . Had the 40 on the oltaco way to ricey for v6 had to put a cherry bomb on it !! Jeez what a hassle huh ? I like the 70 because it fit right n 2 little snips it was n . Very pleased so far just saying !!

Yes, went to their website.

I do plan to have the muffler guys listen to the Gibson. Hopefully they can tell me if the 50 is louder. If not, then how much louder they think the 44 is. 70 would be too quiet. Again, I'm happy with the volume of the Gibson, just not with the high RPM performance.

Yes I had the gibson on the taco before all the other flowmasters , it has a certain buzz for lack of a better word . If what your wanting is a little more rumble delta 50 , but not wake the neighbors up n the morning !

i have the 40 series on my v8, i love it! it sounds aggressive through the entire power band. exhaughst sounds much better when coupled with an intake as well

I have a Magnaflow on my 03 V8 and the sound is great. I have it dumped in front of the rear axle and there's no drone at highway speeds and it's not too loud at lower speeds.

On my Dad's 05 V8 we went with the Flowmaster 40 series, also dumped in front of the rear axle. Let me say that it's much louder than the Magnaflow. The tone has a bit more rasp under WOT and rumbles a bit more even after you let off. Honestly I don't know which I prefer they both sound great, but the Flowmaster sounds a bit meaner.

I'm running a cat back set up with the flowmaster 50 SUV and its the best choice IMO to get a v8 sound out of a v6... Everything else just sounds funny on a v6 IMO, but to each his own

I love my Gibson. I think it's perfect throughout the entire RPM range.

i had the flowmaster 50 on my Nissan Frontier which is a higher revving engine. I personally liked the sound of it, and from what i've heard out of the Gibson, it seems to be very comparable. I would go for the 40, as I was also slightly unimpressed by the tunerish sound the 50 gave off when i mashed the pedal.
My good buddy has an 04 Z71 tahoe with the flow 40s, and they're very deep and smooth, i love it.

My exhaust guy clamped 3 different ones so i could hear a rough comparison, maybe yours would be open to that?

So in conclusion, I believe the 40 would sound great on yours.

I've been out of the flowmaster game for a while, but I ran teh 50SUV on my Jeep with the V8 and OH GOD do I miss that sound. Not loud, but rumbly and if you shut off the OD and accelerated through an intersection you could tell everyone was looking for the Camaro or the Mustang.

Have you considered a dynomax super turbo.

Great idea! I'll see if he'll do it.

How is the drone inside the vehicle? Can you hear your audio system okay?

You don't get the "woosh" sound at higher RPMs?

I don't really notice that. It sounds pretty aggressive IMO. I don't really floor it that much either, but when I do I never thought it sounded bad.