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  1. #1
    Sr. Apprentice
    Join Date
    Feb 2009
    Location
    Northwest Wisconsin
    Posts
    45

    Default Performance Exhaust Dual vs. Single Exit

    Hey guys, i'm looking into adding a performance exhaust system to my Silverado 5.3L and i'm wondering what opinions you have as far as going with the dual exit vs. the single side. Do you get much more HP and MPG with the dual? I will be going with Magnaflow and the two systems i'm looking at are a dual 2.5" pipe with 3.5 tips, vs a single 3" pipe with a 4" tip. Let me know what you think, thanks!
    04' Silverado LT 5.3L w/ S & B intake, Banks Monster Exhaust Cat-back 3" to 5" Tip

  2. #2
    Sr. Apprentice
    Join Date
    Sep 2008
    Location
    Quad Cities USA
    Posts
    43

    Default

    I installed the Magnaflow 3" kit with the 4" tip on my truck about a month ago. I love the sound, it's nice and mellow at idle and rumbles pretty good til about 4k, but after that, it sounds like a damned pro stock car (not quite). I got the single over the dual kit for 2 reasons. 1st, I've had dual exhaust kits where the tips aren't positioned perfectly or not been level, now I'm sure Magnaflow has this down pat and it's probably not an issue but I didn't want to take a chance. 2nd, I let my truck run in the garage for a few minutes in the winter, my garage is 24x24 and my truck is backed in pretty close to the back wall, I didn't want the exhaust to discolor or fade my paint on my garage wall. The kit was pretty easy to install, the only tip I'd give you if you're doing it yourself, try not to break the factory studs at the donut flange where the aftermarket kit bolts to the stock y-pipe, both of mine broke and it took me longer to fix that than to install the rest of the exhaut.
    2005 Silverado 1500 LS Z71. Extended Cab Shortbed. L33 5.3, 4.10.

    Coming Upgrades:
    Volant CAI
    Magnaflow 3" Single Cat-Back
    Superchips Cortex

  3. #3

    Default

    If you're getting a single muffler set-up, I'm pretty sure you won't see any performance difference between a single-out or dual-out system. I won't say I'm positive because I'm not a pro, but the shop that installed my exhaust (Magnaflow muffler replacement w/ tip) told me the only thing a dual exit set-up would change is the tone.
    Matt
    Hallsville, TX

    2005 Silverado 1500 LS Crew Cab 5.3L 2WD
    K&N FIPK II
    Magnaflow Exhaust
    Hypertech Max Energy Programmer
    Suspension Leveling Kit
    Putco Element Window Visors
    Carriage Works Billet Grille
    TruXedo TruXport Tonneau Cover


  4. #4
    Jr. Engineer
    Join Date
    Jan 2009
    Location
    Rochester, MN
    Posts
    231

    Default

    You aren't going to notice any difference. The dual tips will give you 1.39 times the volume after the muffler compared to the single outlet but those dual tips are going to be longer than the single outlet since they have to go to the back of the truck and snake around the axle/spare tire which will probably make up for the difference in volume. Also once you get back to the tail pipes, it's not going to make much of a difference since it's so far back in the system, especially if you have stock manifolds, stock cats, stock Y-pipe because there is so much more restriction there. You should make your decision based on function, price, and visual preference.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  5. #5

    Default

    The last time I had exhaust installed, I went with "true" duals, from the "cats" back. I used the FLowmasters with 3.5" tips. I don't know if a single pipe would be any better or not.


    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    ===============
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  6. #6
    Sr. Apprentice
    Join Date
    Feb 2009
    Location
    Northwest Wisconsin
    Posts
    45

    Default

    I called the local exhaust shop today just to get some estimates and he mentioned using an accelerator muffler? How generic are these mufflers and how do they sound?
    04' Silverado LT 5.3L w/ S & B intake, Banks Monster Exhaust Cat-back 3" to 5" Tip

  7. #7

    Default performance exhaust-single or dual ?

    i have single 3in. magnaflow, fits perfect, sounds great and is good up to 400 horsepower. so unless you like the look of duals or have over 400hp save your money. also i've seen duals burn full size spare tires mounted under trucks when towing heavy trailers. hope this helps .

  8. #8
    Sr. Apprentice
    Join Date
    Feb 2009
    Location
    Northwest Wisconsin
    Posts
    45

    Default

    Thanks for the info...i'm thinking of going with the single, but now i'm trying to decide how big of pipe, would 4" be too big into a 5" tip...or should I stick with the 3" 4" tip combo?
    04' Silverado LT 5.3L w/ S & B intake, Banks Monster Exhaust Cat-back 3" to 5" Tip

  9. #9

    Default

    don't know if you would like the look, but i went with the Magnaflow dual tips side exit before the rear tire. Easier to install your self. It is two peices and you don't have to go over the axle. I have yet to see another truck where I live with this set up.
    2008 Silverado 1500 Ext Cab 4wd LT1 Package with 20" wheel upgrade,K&N CAI, Magnaflow Catback Dual Side Exit, Tuff Country 2" Leveling Kit, Blackbear Tune, 6k HIDS Low and High Beams, 3K HID fog lights, LED tailight bar

  10. #10
    Sr. Apprentice
    Join Date
    Feb 2009
    Location
    Northwest Wisconsin
    Posts
    45

    Default

    Well I think I decided what exhaust i'm going to go with. I found a magnaflow muffler with 2.5" inch pipes and 3.5" tips and all hangers and bolts for $235 including shipping from a muffler shop on ebay. This is a great price and i've talked to the store and some of the customers and the system sounds pretty good.
    04' Silverado LT 5.3L w/ S & B intake, Banks Monster Exhaust Cat-back 3" to 5" Tip

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