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Thread: The Power of 2.5- vs. 3-Inch Exhaust - Engine Masters

  1. #1

    The Power of 2.5- vs. 3-Inch Exhaust - Engine Masters


    2004 Silver Birch
    300B
    Build date:9/29/2003, Adopted on 12/02/05
    Exhaust by Greg
    13.630 @ 100.49 mph (11/21/10)

    2015 Ford Focus SE Sport FWD
    2013 Lincoln MKS EcoBoost AWD (377whp/423tq).
    2010 Ford Fusion Sport FWD
    1989.5 Ford Mustang 5.0 LXsport

  2. #2
    Join Date
    Jan 2006
    Location
    Northern California
    Posts
    2,373
    Great video to help newbies like me better understand the effects an exhaust system has on rwhp and torque.

    Big myth busted: your engine needs some back pressure, so stay with 2.5" exhaust over 3.0".

  3. #3
    Join Date
    Oct 2010
    Location
    4 miles from insanity and 2ft from broke!
    Posts
    9,559
    I watched it last night, interesting.
    04 MERCURY MARAUDER build date:02/11/04
    ITS ALIVE !!!!!!!!

    STAY TUNED!!!!!!!!!!

    **WHIPPLE 4.0L CRUSHER!**0000 (FOR NOW) RWHP

    VISIT MY GARAGE FOR A FULL LIST OF MODS

  4. #4
    Join Date
    Jul 2008
    Location
    North Georgia
    Posts
    3,990
    Makes me glad I went with 3".........

  5. #5
    Join Date
    Jun 2011
    Location
    Northeast OH
    Posts
    7,999
    Quote Originally Posted by CWright View Post
    Makes me glad I went with 3".........
    Gimme 100 of your ponies and you can stay at 2.5 and so can I. : D
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  6. #6
    Join Date
    May 2009
    Location
    Moreau Island
    Posts
    12,207
    Two questions come to immediately to mind. They used no H or X pipe. So what about this harmonic exhaust pulse I keep hearing about? Second they made no mention of the size of the exhaust vs.the power the engine is producing. I'm not convinced a 3" exhaust system would benefit a stock Marauder.

  7. #7
    Join Date
    Jul 2008
    Location
    North Georgia
    Posts
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    Quote Originally Posted by RubberCtyRauder View Post
    Gimme 100 of your ponies and you can stay at 2.5 and so can I. : D
    Come and get em!

  8. #8
    Join Date
    Jul 2008
    Location
    North Georgia
    Posts
    3,990
    Quote Originally Posted by Mr. Man View Post
    Two questions come to immediately to mind. They used no H or X pipe. So what about this harmonic exhaust pulse I keep hearing about? Second they made no mention of the size of the exhaust vs.the power the engine is producing. I'm not convinced a 3" exhaust system would benefit a stock Marauder.
    Bryan Jones said the rule of thumb was 1" per 100HP.

  9. #9
    Join Date
    Jun 2011
    Location
    Northeast OH
    Posts
    7,999
    I have heard dual 2.5 should be good to around 600 hp
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  10. #10
    Join Date
    Jan 2003
    Location
    Near Knoxville TN
    Age
    67
    Posts
    10,717
    I have 2-1/2 inch exhaust. And factory tips.

    And cats.
    Thanks to Darrin @ BC Automotive:
    $1800 and it was worse than when he started!

    Brian (FordNut) FPG # 1458 of 7838
    03 MM 300A (Lotsa mods, 130k mi) was 303rwhp/318rwtq N/A
    then 476/410 D1SC ProCharged on stock block
    then 660/555 D1SC PC on 5.3 wet sleeved Teksid alum big bore stroker
    then 365/369 N/A on 5.3 wet sleeved Teksid alum big bore stroker
    Now 751/617 3.4L Whipple on 5.3 Boss5.0 iron big bore stroker

    03 MM 300B Silver (Mostly stock, originally wife's car, 370k mi) FPG # 7053 of 7838 or 49 of 417 SB
    03 MM 300B Silver, Stock, wife's next one, 136k mi FPG # 7134 of 7838 or 89 of 417 SB
    04 MM Silver, Stock, on standby 85k mi, FPG # 1212 of 3214 or 432 of 997 SB
    01 F150 longbed
    01 F150 shortbed
    00 F150 4x4 stepside
    01 F150 4x4 7700
    68 Stang FB (70 351C 4V, 4 wheel discs, project car)

    Mods listed here (some items not current): FordNut's Mods

  11. #11
    Quote Originally Posted by FordNut View Post
    I have 2-1/2 inch exhaust. And factory tips.

    And cats.
    So what you are trying to say is that you could be making more power.

    2004 Silver Birch
    300B
    Build date:9/29/2003, Adopted on 12/02/05
    Exhaust by Greg
    13.630 @ 100.49 mph (11/21/10)

    2015 Ford Focus SE Sport FWD
    2013 Lincoln MKS EcoBoost AWD (377whp/423tq).
    2010 Ford Fusion Sport FWD
    1989.5 Ford Mustang 5.0 LXsport

  12. #12
    Join Date
    Oct 2014
    Location
    Cunningham, Kansas
    Age
    70
    Posts
    695
    Interesting, but the video could have been edited to about 1 minute. Editing of course would have left out the Amsoil and Magnaflow commercials. Good information and about as expected. Including an X-pipe or H-pipe would have been interesting.
    Last edited by Fastbob; 05-16-2016 at 02:51 PM.
    2004 SB #2150 of 3214 Moonroof, Heated Seats and 6 CD Changer. Non OEM Mufflers and 32,XXX miles and counting.

  13. #13
    Join Date
    Nov 2014
    Location
    KC
    Age
    48
    Posts
    3,511
    That engine is twice the size of ours, so it's moving a bunch more air!

    I would have liked to see the exhaust less than 20 feet in length lol
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

    Current marauders
    04 DTR totaled JUST NOW starting to part out 7-21-2021 https://youtu.be/REUxjP1BVpg

    04 Silver Birch Dark Charcoal Hardtop Whipple Supercharger
    04 Silver Birch Dark Charcoal Hardtop V2 Supercharger
    04 Silver Birch Dark Charcoal Converted
    03 DBP Light Flint #122
    03 DBP Dark Charcoal #232
    03 Silver Birch 300b Light Flint Going to fix er up
    03 Black 300a
    04 Silver Birch Dark Charcoal moonroof in the works

    04 Heaton Swapped DTR
    Joe's Wrecked DTR rebuild thread

  14. #14
    Join Date
    Jan 2003
    Location
    Near Knoxville TN
    Age
    67
    Posts
    10,717
    Quote Originally Posted by FordNut View Post
    I have 2-1/2 inch exhaust. And factory tips.

    And cats.
    Quote Originally Posted by ctrlraven View Post
    So what you are trying to say is that you could be making more power.
    Maybe I could, but I'm really saying 2.5 is ok for way higher than this V V V
    Quote Originally Posted by RubberCtyRauder View Post
    I have heard dual 2.5 should be good to around 600 hp
    Thanks to Darrin @ BC Automotive:
    $1800 and it was worse than when he started!

    Brian (FordNut) FPG # 1458 of 7838
    03 MM 300A (Lotsa mods, 130k mi) was 303rwhp/318rwtq N/A
    then 476/410 D1SC ProCharged on stock block
    then 660/555 D1SC PC on 5.3 wet sleeved Teksid alum big bore stroker
    then 365/369 N/A on 5.3 wet sleeved Teksid alum big bore stroker
    Now 751/617 3.4L Whipple on 5.3 Boss5.0 iron big bore stroker

    03 MM 300B Silver (Mostly stock, originally wife's car, 370k mi) FPG # 7053 of 7838 or 49 of 417 SB
    03 MM 300B Silver, Stock, wife's next one, 136k mi FPG # 7134 of 7838 or 89 of 417 SB
    04 MM Silver, Stock, on standby 85k mi, FPG # 1212 of 3214 or 432 of 997 SB
    01 F150 longbed
    01 F150 shortbed
    00 F150 4x4 stepside
    01 F150 4x4 7700
    68 Stang FB (70 351C 4V, 4 wheel discs, project car)

    Mods listed here (some items not current): FordNut's Mods

  15. #15
    Join Date
    Oct 2010
    Location
    4 miles from insanity and 2ft from broke!
    Posts
    9,559
    2.5" exhaust is fine for the majority of applications , but it has it's limitations as with anything else, my car had the 2.5" stainless works exhaust system when it was on the dyno , it now has a full 3" Vband Stainless Steel Exhaust, and runs much better , next dyno will tell how well.
    04 MERCURY MARAUDER build date:02/11/04
    ITS ALIVE !!!!!!!!

    STAY TUNED!!!!!!!!!!

    **WHIPPLE 4.0L CRUSHER!**0000 (FOR NOW) RWHP

    VISIT MY GARAGE FOR A FULL LIST OF MODS

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