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  1. #1

    Default X-Pipe performs better w Chambered muffler OR Straight through muffler? Any idea?

    i need some help with figuring out if having my magnaflow x pipe with my flowmaster chambered muffler is holding me back a few pony's and torque compared toa straight thru muffler design like magnaflow?

    2008 Chevy Silverado Ext. Cab Lt Z71 5.3 V8
    7.5 Inch Rough Country Suspension Lift
    RBP Replica Grille Black w Chrome Rivets
    Recon Smoked Cab Roof Lights
    N-Fab Powdercoated Gloss black Cab Length Nerf Steps
    5% Tint over 20% all the way around / 5% Eyebrow Strip
    AVS Smoked Window Visors
    Z71 Stickers Black & Metallic Silver
    Tow Mirrors / Smoked Turn Signals
    XM Satellite Radio Fin / Color Matched
    Interior Plastic Pieces / Color Matched
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    Painted Bowties / Color Matched
    Painted Door Handles / Color Matched
    Smittybilt Bull Bar / Color Matched
    Custom Rolled Edge Exhaust Tips / Color Matched
    Custom 2.5 Inch Cat Back True Dual Exhaust
    Flowmaster Super 40 Series Dual in / Dual out
    Magnaflow Tru-X Pipe
    K&N Air Filter
    18x9 Rockstars Machined Black
    Center Caps / Color Matched
    33.13.50 Nitto Terra Grapplers
    New Front Wheel Well Liners
    Eagle Eye Black L.E.D. Tailights
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    Eagle Eye Black L.E.D. Halo Projector Headlights
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    Recon L.E.D. Light Bar
    Buschwacker OE Style Tailgate Cap
    AMI Gloss Black Antenna
    Debadged Chrome Lettering
    Door Molding Removed

  2. #2


    The word is that Flowmaster is for sound and Magnaflow are for performance. I would think that a straight through design would help out with the ponies versus a chambered or baffled muffler. However, will you notice the difference on the butt dyno? I doubt it.

    2007 Silverado VortecMAX R.I.P 24JUN2011
    2005 Honda VTX 1300R
    2008 Tahoe LTZ
    2009 Dodge Challenger R/T

  3. #3


    yeah idk what i might just keep my flowmaster on then.

  4. #4


    ya ive read only up to like 5ish from switching i honestly wouldnt go threw the hassle or expense to do in my self?
    2004 gmc sierra ext z71 5.3
    KB racing hot pipes 3.5" : 76mm turbo: 4l80e : Circle-d 2b multi disk :Walbro 400 : Racetronix Hotwire kit : TB coolant bypass : Nelson 91 Pcm : Tr 220 Cam : Brian Tooley double springs kit : Ls7 Lifters : Stage 3 heads : Custom Intake Manifold :80lb Injectors : Ported TB : 40k tranny cooler: Plx dm-100 gauge: Auto meter fuel and boost gauge:
    Custom Speedo : Leveling kit :Smoked led taillights and 3rd break light : Black projectors and fogs with hids : Blacked out grille : 33's on 16's : Clarion flip screen: sound que 12" subs: clerion 6x9's : Memhpis amps: Alpine componet set.
    Future mods... Detriot tru-trac, deviels own stage 2 meth kit, MORE BOOST!!!!!!!!!!!!!!

  5. #5


    yeah i mean i could prob sell my flowmaster to a buddy and get most my money back and everything but i doubt i will do that. I have to take my truck up to the muffler shop to get the pipe that leads to my x pipe fixed the GENIUS cut the pipe too short since he didn't measure how far to cut with the x pipe and ended up looking under my truck and he cut pipe he had at the shop and the **** was damn crooked what a piece of **** i swear, hopefully he does it right this time i mean it's not really that hard to do if you know how to use a tape measure lol!

  6. #6


    I believe you have already free'd up about as much pony as you can with the Xpipe and flowmaster combo. Sure the straight through mufflers gives a little better power but i dont believe its enough to justify the swap from flowmaster. Now if your swapping from OEM, then yes.

    2009 Silverado 1500
    5.3L / 3.73 G80 / 4spd / 4x4 / LWB/ Ext Cab / HD Tow-Haul
    2.25in ReadyLift Level Kit / 3in blocks/ 3500lb HellWig / 265x65x17 Wrangler AT
    K&N Filter / AirRaid MIT / MagnaFlow 2.25" Dual Exhaust / HyperTech MaxEnergy

  7. #7


    Yeah i totally agree man i appreciate it.

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