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Thread: Dynomax/ Magnaflow/ Flowmaster
10-19-2011, 03:27 AM #1
- Join Date
- Oct 2011
Dynomax/ Magnaflow/ Flowmaster
I have a 2011 GMC Sierra 5.3 and I am looking to put a new SI/DO muffler on. I like the sound of the Flowmaster Super 40 but I read on a few places it does nothing for performance, so I've also been looking at the Dynomax Ultra Flo and the Magnaflow XL mufflers. I was wondering what your guys thought are on how these three mufflers compare.
10-19-2011, 12:03 PM #2
Welcome to the club, Chris. Todays stock mufflers actually flow quite well, so you don't see/feel a performance gain with just a muffler replacement. Muffler replacement only is really just giving you the sound. Cat-back kits have larger diameter pipes that are mandral bent so you get more flow.:cool:
2005 Chevy Silverado Z71 Crew Cab
6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
B&M aluminum deep transmission pan
Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
Weather Tech floor mats
Cover-Craft seat covers
Dash mat cover
Formula One window tint
One black Lab in rear seat.
10-19-2011, 10:09 PM #304 ECSB Custom silver & grey, Soft 8's, BFG KO's, ReadyLift Leveling Kit, Hellwig front sway bar, K&N filter, DeeZee EZ-Down, Rhino liner, Alpine CDE103BT, Rockford 6.5's, 12" V.A.T. Hammer Pro in a Subthump box, Alpine PowerPack amp, Hifonics amp, BackRack w/ 55w 5000k HID KC Daylighters, KC light bar with 4 KC Slimlites, UWS toolbox, Shaved Antenna mod, Black Bowtie, LED backup, license plate, dome lights & 3rd brake light
10-20-2011, 09:25 AM #4
- Join Date
- Oct 2011
The flowmaster 40 series sounds great and I've been considering putting it on my truck too. However if your looking for performance than you might wanna go with a cat-back system like silveradotrailblazer and telorvehc suggeested.
11-06-2011, 12:07 AM #5
What ever you do, look into getting a xlerator muffler. single in dual out. cat back. on top of that look into getting pipes that have 3 1/4 tip2002 Gmc sierra
5.3 v8 1500
k&n air intake
20inch liquidmetal dyno 6's
xlerator dual exhaust.
11-07-2011, 10:03 PM #6
I would suggest the magnaflow's
2003 GMC Sierra 1500 SLE 5.3
2.5 ReadyLift Leveling Kit
Low Profile Toolbox
Westin Nerf Steps
03-02-2012, 10:56 AM #7
- Join Date
- Feb 2012
I have a Dynomax VT SI/SO exhaust system on my 2010 5.3 4x4 Crew w/K&N Drop in filter. Nice sound, no drone and noticeable performance gain. Installed 30 days ago. So far, very happy...excellent quality product...for $290 at JEGS.
04-12-2012, 02:44 PM #8Truck: 2005 GMC Sierra SLT
Toy: 2006 Honda 599
04-12-2012, 03:33 PM #9
I was quoted $350 for a catback exhaust system at my local exhaust shop. Its not really expensive. You would lose money if you decided to get a single in single out muffler and then a single in dual out exhaust. You would spend $200 just for the mufflers. Why not just get a cat back exhaust system now instead of getting a year later. As for the flow, I believe an aftermarket muffler would be an improvement, but I don't think it's going to be very noticeable difference.Year/Make/Model: 2003 Chevrolet Silverado 1500
Powertrain: 4.8L V8, Automatic, 2wd
Tires/Rims: Stock rims and tires for now
Top 5 Mods: Straight piped exhaust, Billet Grille, Color-matched bowtie/shaved moldings, 12K HID's, Two 12" Kickers with a 1,000 watt amp
Next Planned mods: Truxxx Leveling Kit, Nitto Trail Grapplers, 15% Window Tint
04-12-2012, 06:49 PM #10
I guess I do tend to nickel-and-dime myself with things like this... I'll have to keep thinking about it. Thanks for your thoughts.
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