Exhaust size match up.
#11
10-02-2014, 10:58 AM
More aggressive sound ALWAYS increases BUTT DYNO numbers, LOL...
When I completely ditched my stock exhaust and went LT headers and dual right back to a wide open "Y" just before the SI/DO muffler the dyno showed like 22 HP gained at the rear wheels. My BUTT DYNO was registering 75+, LOL...
When I completely ditched my stock exhaust and went LT headers and dual right back to a wide open "Y" just before the SI/DO muffler the dyno showed like 22 HP gained at the rear wheels. My BUTT DYNO was registering 75+, LOL...
#12
10-02-2014, 08:00 PM
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It may seem quicker, but in reality it's not. Simply adding a free flow muffler to an otherwise stock truck will not give any noticeable gains in power. This is a proven fact. The stock muffler is not the most restrictive part of a factory exhaust anyhow. You still have a Y pipe and manifolds impeding flow. And with the stock Throttle body and post TB intake system the restrictions are still there. And to add you installed an undersized muffler and in turn introduced another restriction which likely negates the effects of a free flow over stock muffler as well.
Even in the drag racing world you would be amazed at how much you need to do just to shave off a tenth of a second in 1/4 mile times. In the world of performance parts for trucks like ours most of the easiest mods make no real gains. The factory has made these trucks so efficient that you need to do either use a programmer or do major mods (Throttle bodies, headers, head porting, etc) to really make any noticeable gains.
Minor HP increases are typically only noticeable on a Chassis Dyno or through 1/4 mile times. It also comes down to the gain over what the stock HP is. As an example, if your lawnmower is 5 HP and you add 2.5 more HP the difference will be very noticeable as you added 50% more HP. But when you take a truck that already puts out almost 400 HP and add a muffler that if sized correctly MIGHT add 4-6 HP alone (and even that number is debatable) then you are talking an increase of maybe 4%. You would never feel that. Want another simple example? That's like adding 4" in height to a 400' tall building. You would never notice. But add 4" to a person who is 6' tall and you notice right away. Because it's a more substantial gain from the starting point.
Psychologically it feels faster because it's louder. The same way people assume their car is magically quicker when they install a high flow air filter when in reality their is no increase. It simply sounds more powerful.
Even in the drag racing world you would be amazed at how much you need to do just to shave off a tenth of a second in 1/4 mile times. In the world of performance parts for trucks like ours most of the easiest mods make no real gains. The factory has made these trucks so efficient that you need to do either use a programmer or do major mods (Throttle bodies, headers, head porting, etc) to really make any noticeable gains.
Minor HP increases are typically only noticeable on a Chassis Dyno or through 1/4 mile times. It also comes down to the gain over what the stock HP is. As an example, if your lawnmower is 5 HP and you add 2.5 more HP the difference will be very noticeable as you added 50% more HP. But when you take a truck that already puts out almost 400 HP and add a muffler that if sized correctly MIGHT add 4-6 HP alone (and even that number is debatable) then you are talking an increase of maybe 4%. You would never feel that. Want another simple example? That's like adding 4" in height to a 400' tall building. You would never notice. But add 4" to a person who is 6' tall and you notice right away. Because it's a more substantial gain from the starting point.
Psychologically it feels faster because it's louder. The same way people assume their car is magically quicker when they install a high flow air filter when in reality their is no increase. It simply sounds more powerful.
#13
10-02-2014, 08:03 PM
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You tell 'em... I had an Extreme on my '04 and it sounded WAY better than the rusted out, POS Flowmaster 50 I replaced it with. The FM droned like crazy right at highway cruising speed (and I was pre-MDS trucks), and the CB Extreme never droned at any speed. I always got positive comments from everyone on how my truck sounded. Although LT headers, CAI and a completely free Y pipe had something to do with it as well.
FM lasted three years and the top was swiss cheese. CB was on for a lot longer until I sold the truck last month and aside from some surface rust was still intact.
I will admit though, I would have thought a simple, single wing plate muffler would be hideous sounding with MDS. Glad to hear from you I would have been wrong...
FM lasted three years and the top was swiss cheese. CB was on for a lot longer until I sold the truck last month and aside from some surface rust was still intact.
I will admit though, I would have thought a simple, single wing plate muffler would be hideous sounding with MDS. Glad to hear from you I would have been wrong...
#15
10-06-2014, 06:46 PM
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No drone at all!!! Even on the interstate going 75!! That is with a steady pace with cruise set. When you start to go up a hill and the gas increases it starts to drone a bit but other than that it's not bad. And with the MDS, you can't even tell it's on. Now, when I am idling through town at about 35 you can kind of hear it but its not annoying by any means.
#16
10-06-2014, 11:17 PM
No drone at all!!! Even on the interstate going 75!! That is with a steady pace with cruise set. When you start to go up a hill and the gas increases it starts to drone a bit but other than that it's not bad. And with the MDS, you can't even tell it's on. Now, when I am idling through town at about 35 you can kind of hear it but its not annoying by any means.