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  1. #11

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    Quote Originally Posted by zigger215 View Post
    You know that's bad for your truck right? And you lose quite a bit of horsepower. Your engine relies on the "H" pipe on your truck to equal out the head pressure from what side to the other. You will lose fuel economy, horsepower and your truck will sound god awful. All the really nice sounding trucks and hot rods all have "H" pipes.

    My exhaust setup suggestion would be the same as mine, long tube headers, and then cutting the muffler off and doing duals from there out the back. Your factory cats are already high flow so don't waste your money on doing anything from the cats to the factory muffler. Leaving the "H" pipe in will help you. The "H" pipe is the pipe from your y-pipe splitter to your factory muffler.

    My personal setup has no muffler, just headers and duals where the muffler once was. I have more power, better fuel efficiency and it sounds so good even die hard Toyota, ford and dodge guys give my truck a thumbs up.
    X2 on the H pipe. Nothing like pulling up next to a sweet looking truck and when the guy gets on it, it sounds like two four cylinder motors running next to each other.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  2. #12
    Master Mechanic zigger215's Avatar
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    Quote Originally Posted by TimTom64b View Post
    I have American racing headers with their highflow cats in combination with a Corsa high performance sport exhaust. It sounds awesome... There isn't a truck in my area that has that same tone. You know you have something when all the guys at the local auto shops stop and turn their heads when you go by.... When you order headers you'll have two choices for pipe and collector sizes. The larger pipe will give you a lower tone... The.smaller pipe will give you more bark. I went with the larger... 1 7/8 headers on my truck. The headers and exhaust combination will really wake up.your truck... But you'll need to re-program your ecm and tcm to take full.advantage though.
    That is a SWEET setup!! I bet it does sound nice. I just went with a high end set of flowmaster headers and took the truck to a local exhaust shop with a good reputation and they did the header setup and replaced the muffler with dual exhaust angled out if the back. I love the look and the sound is music to my ears.

  3. #13

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    Ive already decided to take the stock y pipe cat combination off but if i ran strait pipes to a two inlet two outlet muffler would that do the same thing?

  4. #14

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    Yes... Basically the y pipe and dual inlet and outlet muffler are designed to equalize the back pressure for both sides of the engine. That's my understanding anyway.
    2009 Chevy Silverado 2500HDLT 6.0L w/ Towing Package, Dick Cepek GM8 Rims, Dick Cepek FC II 33X11.50R17,RKSport Ram-Air Hood(Functional), Lazer Lite Aluminum Tonneau Cover, Road Armor Stealth Bumper, PIAA Lighting, Diablo Trinity Tuner, Diablew Custom Tune, BullyDog Cold Air Intake, American Racing Headers w/highflow cats, Corsa Performance Sport Exhaust, Custom Striping, Black Bowties front and rear, Fuel Grille Inserts, Recon Headlights, Readylift Shocks, Readylift Upper Contol Arms, 2" Blocks in the Rear..

    Future Plans: HD Tie Rods, Under hood upgrades, Crower Camshaft and possibly electric fans.

  5. #15

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    Well what if i took off te cats will the pressure still equalize alright? The reason I wana take the cats off is cause they are rusting off and one had a leak but I patched it. Im just thinking why not just take it off and not waist the money for new ones

  6. #16
    Master Mechanic zigger215's Avatar
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    Removing the cats is fine. At any rate, when you do this exhaust setup, you're still gonna want to get the truck retuned for the setup. Headers, cats deleted and dual exhaust (real dual exhaust with the "H" pipe intact) will be INCREDIBLY loud if you also went with no muffler...mine is super loud with cats...

  7. #17
    Master Mechanic zigger215's Avatar
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    Quote Originally Posted by TimTom64b View Post
    Yes... Basically the y pipe and dual inlet and outlet muffler are designed to equalize the back pressure for both sides of the engine. That's my understanding anyway.
    That's right, if you ran a dual in, dual out muffler with no cats + headers you would have a good setup

  8. #18

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    what do i need to reprogram?

    - - - Updated - - -

    i plan on putting on mufflers

  9. #19

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    You can get by without the cats... But becareful with your local laws regarding. If you remove them you'll just have the annoying check engine code that the cats aren't working properly...)).

    With regards to reprogramming... That engine is going to want more fuel... And the power ban is going to change. What I did with mine was buy a diablo trinity tuner and had Lew fromm diablew tune write me a custom tune.for the ecm and tcm. My truck now runs like a high performance hotrod. If I want I can light the tires up... No power braking bs until I letup on the throttle. The programmer and custom tune are well worth the $$$
    2009 Chevy Silverado 2500HDLT 6.0L w/ Towing Package, Dick Cepek GM8 Rims, Dick Cepek FC II 33X11.50R17,RKSport Ram-Air Hood(Functional), Lazer Lite Aluminum Tonneau Cover, Road Armor Stealth Bumper, PIAA Lighting, Diablo Trinity Tuner, Diablew Custom Tune, BullyDog Cold Air Intake, American Racing Headers w/highflow cats, Corsa Performance Sport Exhaust, Custom Striping, Black Bowties front and rear, Fuel Grille Inserts, Recon Headlights, Readylift Shocks, Readylift Upper Contol Arms, 2" Blocks in the Rear..

    Future Plans: HD Tie Rods, Under hood upgrades, Crower Camshaft and possibly electric fans.

  10. #20

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    Quote Originally Posted by TimTom64b View Post
    You can get by without the cats... But becareful with your local laws regarding. If you remove them you'll just have the annoying check engine code that the cats aren't working properly...)).

    With regards to reprogramming... That engine is going to want more fuel... And the power ban is going to change. What I did with mine was buy a diablo trinity tuner and had Lew fromm diablew tune write me a custom tune.for the ecm and tcm. My truck now runs like a high performance hotrod. If I want I can light the tires up... No power braking bs until I letup on the throttle. The programmer and custom tune are well worth the $$$
    can i get away with briging it in to get tuned and not buying my own tuner?

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