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  1. #11

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    sounds good man.


    2010 Silverado Z71

    Kyle-USAF-MI/VA

    "Fueled by Haters"

    TCS front box 7"-9" set at 8.5" | FTS coilovers(blue coil) with resis and FTS shocks with resis| 20" Fuel Off-Road Revolver Rims | 35x12.50 Nitto Trail Grapplers | Halo Projector Head Lights by Recon- Black | Led Taillights by Recon- Smoked | Dumped Straight pipe | Volant CAI | Ranch Hand Front Bumper | DiabloSport Trinity Programmer | Tow Mirrors with Turn Signal | Cervinis Ram-Air hood | 4.56 USA gears with tru trac locker | Longshot Lighting 6000k 55w low beam and 6000k 35w fogs HIDs | 7" lift leaf spring | Blue TCS traction bars

    Future Mods: Long tube headers
    | Custom tune | Cam | Stall Converter

  2. #12

    Default

    Sounds real good man! I like the tone.
    Adam
    11 Silverado Summit White Ext. Cab 5.3L Z71 9k miles
    RC leveling kit
    Jason fiberglass tonneau cover
    Penda-liner
    Superchips 91 octane tune
    Front air dam removed
    6,000k lowbeams 6,000k fogs
    color match bowties
    color match mudflaps
    20% tint all the way around
    20% tinted 6in sunshade
    Nitto terra grappler 275/70r17 (winter setup)
    Chevy 22s with Bridgestone Alenza 285/45r22 (summer setup)
    Kenwood DNX6180 indash


  3. #13

    Default

    Quote Originally Posted by Red Z71 Max View Post
    Just installed a new Flowmaster dual rear exit slash cut exhaust. It was custom installed at a local shop with a single Flowmaster 40 series muffler with dual exit. Originally I was going to to do Dual Mufflers but the 6.2 has dual Catalytic Converters and it was recommended to not remove the second cat because it would void my warranty. Overall I'm very pleased and I have noticed about a 2mpg increase which is very welcome with todays fuel prices. It all cost $375 out the door. I priced several catback systems and the cheapest dual system I could find was $729 so I save a considerable amount of $$$$(
    I was reading an aftermarket parts trade magazine a few days ago that was talking about the problems of using dual exhausts on the 6.2 engine, GM changed the firing order on this engine to gain more HP and fuel mileage, the problem now is when using a dual exhaust system you have to be careful on pipe size and using a crossover in the exhaust, a crossover must be perfectly placed otherwise the engine gets a weird loping sound at idle and loses some of the torque at take off. Between GM engineers and Magnaflow engineers they figured out the new design needed less backflow at low RPMs and better pessure equalization in the mid range RPMs.
    Magnaflow is working with GM to design a new full dual exhaust system that will take advantage of these issues but they recommend sticking with a single into dual until they can refine the system.

  4. #14
    Legend

    Red Z71 Max's Avatar
    Join Date
    May 2011
    Location
    Myrtle Beach, SC
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    Default

    Quote Originally Posted by tbplus10 View Post
    I was reading an aftermarket parts trade magazine a few days ago that was talking about the problems of using dual exhausts on the 6.2 engine, GM changed the firing order on this engine to gain more HP and fuel mileage, the problem now is when using a dual exhaust system you have to be careful on pipe size and using a crossover in the exhaust, a crossover must be perfectly placed otherwise the engine gets a weird loping sound at idle and loses some of the torque at take off. Between GM engineers and Magnaflow engineers they figured out the new design needed less backflow at low RPMs and better pessure equalization in the mid range RPMs.
    Magnaflow is working with GM to design a new full dual exhaust system that will take advantage of these issues but they recommend sticking with a single into dual until they can refine the system.
    After a recommendation from the installer that is what I installed. The truck is equipped with dual Catalytic converters so they said I should go with a single muffler with dual exhaust. This will help maintain the warranty and keep the proper amount of backflow for the motor!!!

    (Scott) Myrtle Beach, SC
    January 2012 ROTM WINNER
    2011 GMC Sierra Z71 MAX 6.2 L w/ Trailering Package
    Rough Country, XD Rockstars, Nitto Trail Grapplers, N Fab, Lund Genesis, Putco, Gator Grip,
    Flowmaster 40 series, Diablosport InTune, Banks Ram Air CAI,
    WeatherTech, AVS Aeroskin, Tow Mirrors, Upgradeyourauto.com

  5. #15
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    mfleetwood's Avatar
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    Jul 2010
    Location
    Denver, CO
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    Default

    Looks and sounds great...nice job!


    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    TIRES:
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  6. #16

    Default

    Looks awesome, sounds awesome. Thumbs up red, wish I could find a deal like that!


    2003 GMC Sierra 1500 SLE 5.3
    Factory Tint
    Recon Taillights
    2.5 ReadyLift Leveling Kit
    Low Profile Toolbox
    Westin Nerf Steps

  7. #17

    Default

    Good choice of exhaust!! Sounds good man!

    2006 Duramax LBZ
    Edge Evo
    4'' Diamond eye to 6'' tip
    16'' ion alloy, 33'' fierce attitudes
    Lots of work left to do!

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