GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 4 of 4
  1. #1
    Jr. Apprentice
    Join Date
    Jan 2009
    Location
    Bay Area, CA
    Posts
    19

    Default pipe between cat and muffler

    Heres my question....im about to order a muffler and dude at the shop was saying get an inlet diameter of 3" with two outlets at 2.5".

    My question is...should I get the 3"in or bring that down to 2.5" like the rest of the piping? Would I be able to run 2.5" all the way to the cats, then connect that 2.5" pipe to the new 3" pipe going into the muffler? When i aked him why 3" he really didnt provide a good explination.

  2. #2

    Default

    Going through the same myself, Chevy trucks stock have 2 3/4 in ehaust, hope this helps
    04 Silverado
    Manik brush guard
    Readylift leveling kit
    Green Filters CAI
    Pioneer Headunit
    Pro Comp All Terrains (Winter)
    Silverstar Bulbs
    Pro Comp 9851 Lights
    Dick Cepek DC1's wrapped around 285 Toyo Open Countrys (Summer)
    Random chrome bling and lots of stickers
    More to Come with a bigger budget


    And a 78 Bronco for the weekends

  3. #3

    Default

    a 3" pipe will alow you to drop some of that back pressure and free up a few ponies if you went 3" all the way you would loose some due to stock motors not needing such a high flow

  4. #4
    Legend 2ToNe04's Avatar
    Join Date
    Apr 2009
    Location
    Fresno California
    Posts
    1,030
    Blog Entries
    1

    Default

    Quote Originally Posted by grimreapersshadow View Post
    a 3" pipe will alow you to drop some of that back pressure and free up a few ponies if you went 3" all the way you would loose some due to stock motors not needing such a high flow
    ive heard some people lose power, because its suppose to have a certain back pressure.

    Theres this guy on a diff. forum and he was saying he had the Electric Exhuast cutouts, and he ran slower times in the 1/4 mile, when he had them open then when he had them closed. He later ran them closed on launch and opened em when he was on full open throttle down the track.

    i dont think it will matter much in your situation though.

    just my opinion

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
    Future Mods: 6.0 LQ4/9| Bags|

Similar Threads

  1. Exhaust Links and Articles H pipe X pipe Mufflers
    By Dr_Zero in forum GM Powertrain
    Replies: 9
    Last Post: 10-08-2010, 12:37 PM
  2. x pipe
    By sharpshooterusmc in forum General Chevy & GM Tech Questions
    Replies: 4
    Last Post: 05-05-2010, 05:07 PM
  3. X pipe!
    By rackchaser71 in forum Performance & Fuel
    Replies: 3
    Last Post: 03-31-2009, 08:48 AM
  4. h-pipe ?
    By vncj96 in forum Chevy Truck Accessories
    Replies: 1
    Last Post: 04-26-2008, 04:32 AM
  5. WTB Y pipe 93 4x4 350
    By homer911 in forum General Classifieds
    Replies: 1
    Last Post: 09-17-2007, 12:23 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •