Page 1 of 2 12 LastLast
Results 1 to 20 of 23

cutout n catback vs TD

This is a discussion on cutout n catback vs TD within the External Engine forums, part of the LSx Technical Help Section category; ok heres the deal..i have a 01 z28 that has a lid, lt's no cats 3' ory to a pos ...

  1. #1
    HUNTER S. THOMPSON FAN Raoul-Duke's Avatar
    Join Date
    Mar 2006
    Location
    BURBANK
    Posts
    1,120

    cutout n catback vs TD

    ok heres the deal..i have a 01 z28 that has a lid, lt's no cats 3' ory to a pos flowmaster cb...i waaas gonna go true duals but ive heard that due to lack of back pressure that it actually hurts power. people were tellin me unless im pushin 400+ rwhp that i should not go with true duals. bbbut i do NOT want the flowmaster robbin me power as i know it is soo i was thinkin maybe about getting an electric cutout?? what should i do? i was gonna get a pcm tune soo would that help if i were to get true duals?
    01 m6 z28 - lid / lt headers / 3' ory w no cats / flowmaster catback w 3' dmh e-cutout / nelson pcm tune

  2. #2
    member since may 2000 nhraformula's Avatar
    Join Date
    Dec 2002
    Location
    n/w chicago
    Age
    47
    Posts
    6,933

    black
    2000 nhra edition formula

    get the true duals and no need for a tune.
    any loss of back pressure would be minimal.
    you still have stock exhaust manifolds so your car isnt totally free flowing.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  3. #3
    LTX N20LT4's Avatar
    Join Date
    May 2007
    Location
    Cali
    Posts
    2,006
    10's N/A

    With your long-tube/no cat setup, I recommend a different cat-back system or TD's over the cut-out.

  4. #4
    HUNTER S. THOMPSON FAN Raoul-Duke's Avatar
    Join Date
    Mar 2006
    Location
    BURBANK
    Posts
    1,120
    Quote Originally Posted by nhraformula View Post
    get the true duals and no need for a tune.
    any loss of back pressure would be minimal.
    you still have stock exhaust manifolds so your car isnt totally free flowing.
    you sure about minimal back pressure. i remember even after i got my lt headers on my lt1 z w 3' ory no cat and borla cb it i lost a llllot low end power..also i do have longtube headers on my ls1..still go w the true duals?? whats the difference in hp vs me gettin a cutout w my current setup?
    Quote Originally Posted by N20LT4 View Post
    With your long-tube/no cat setup, I recommend a different cat-back system or TD's over the cut-out.
    yeah i dont wanna spend money on a diff cb..but you think i wont suffer a lot from low end power loss. i mean theres gonna be like 100% air flow, lol. and im just a bolt on car...

  5. #5
    LTX N20LT4's Avatar
    Join Date
    May 2007
    Location
    Cali
    Posts
    2,006
    10's N/A

    Quote Originally Posted by Raoul-Duke View Post
    you sure about minimal back pressure. i remember even after i got my lt headers on my lt1 z w 3' ory no cat and borla cb it i lost a llllot low end power..also i do have longtube headers on my ls1..still go w the true duals?? whats the difference in hp vs me gettin a cutout w my current setup?


    yeah i dont wanna spend money on a diff cb..but you think i wont suffer a lot from low end power loss. i mean theres gonna be like 100% air flow, lol. and im just a bolt on car...
    With the true dual system you'll be fine, but I can't say the same about the cut-out. I tried the LT/ORY with cut-out before (on an LT1 car) and it was just too much exhaust - loss of low-end, so I would go for the TD setup!

  6. #6
    HUNTER S. THOMPSON FAN Raoul-Duke's Avatar
    Join Date
    Mar 2006
    Location
    BURBANK
    Posts
    1,120
    Quote Originally Posted by N20LT4 View Post
    With the true dual system you'll be fine, but I can't say the same about the cut-out. I tried the LT/ORY with cut-out before (on an LT1 car) and it was just too much exhaust - loss of low-end, so I would go for the TD setup!
    but if you think ill have a loss of low end w the cutout i would think it would be far greater with true duals..see w my td setup im dumpin it before the rear axle so there wont be a catback. just headers to x-pipe to bullets and turndowns. that, i would think would have far greater low end loss

  7. #7
    LTX N20LT4's Avatar
    Join Date
    May 2007
    Location
    Cali
    Posts
    2,006
    10's N/A

    Quote Originally Posted by Raoul-Duke View Post
    but if you think ill have a loss of low end w the cutout i would think it would be far greater with true duals..see w my td setup im dumpin it before the rear axle so there wont be a catback. just headers to x-pipe to bullets and turndowns. that, i would think would have far greater low end loss
    Yeah, you could definitely be right about that. I am not exactly sure, as I have never ran a true dual setup before to compare, but I am sure someone else will chime in here to give you an expert opinion.

  8. #8
    HUNTER S. THOMPSON FAN Raoul-Duke's Avatar
    Join Date
    Mar 2006
    Location
    BURBANK
    Posts
    1,120
    Quote Originally Posted by N20LT4 View Post
    Yeah, you could definitely be right about that. I am not exactly sure, as I have never ran a true dual setup before to compare, but I am sure someone else will chime in here to give you an expert opinion.
    yeah thats just what i would think, i def appreciate your help though

  9. #9
    HUNTER S. THOMPSON FAN Raoul-Duke's Avatar
    Join Date
    Mar 2006
    Location
    BURBANK
    Posts
    1,120
    de bump

  10. #10
    Member Speed Psychosis's Avatar
    Join Date
    Dec 2007
    Location
    Virginia
    Age
    28
    Posts
    499

    Red
    98 T/A M6 w/lid and LM1

    i think u'd be fine with true duals. many people run em and don't complain. remember the pipe itself produces a good amount of pressure. open headers might be bad, but evev mufflerless true duals should be fine, as long as you don't have dual 5" piping or anything crazy like that.

  11. #11
    Member
    Join Date
    Sep 2006
    Location
    ohio
    Posts
    213
    98 Z28 M6

    I did LTs, ORY, cut out and picked up around 40 RWHP and 30TQ. It is loud but thats when you just close it up if you dont like it. Either way the true duals or the cut out would work just fine and you shouldn't loose much if any power.

  12. #12
    Knight of Chaos xzaero0's Avatar
    Join Date
    May 2007
    Location
    Nebraska
    Age
    37
    Posts
    468

    Black
    2000 Trans Am

    Quote Originally Posted by Raoul-Duke View Post
    ok heres the deal..i have a 01 z28 that has a lid, lt's no cats 3' ory to a pos flowmaster cb...i waaas gonna go true duals but ive heard that due to lack of back pressure that it actually hurts power. people were tellin me unless im pushin 400+ rwhp that i should not go with true duals. bbbut i do NOT want the flowmaster robbin me power as i know it is soo i was thinkin maybe about getting an electric cutout?? what should i do? i was gonna get a pcm tune soo would that help if i were to get true duals?
    If you have heared that running TDs has less back pressure and hurts power why would you expect that a cut out that completely opens your exhaust and prolly has even less back pressure would any different?


    Go TDs, It sounds so much better than most set ups IMO, and should produce more power with the same mods.

  13. #13
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    True Duals. They sound great, and will support anything in the near future. Plus, they sound great, did I already say that?

  14. #14
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
    Join Date
    Oct 2006
    Location
    doylestown, Pa
    Posts
    6,818

    SILVER
    2004 CTS-V

    Quote Originally Posted by Raoul-Duke View Post
    you sure about minimal back pressure. i remember even after i got my lt headers on my lt1 z w 3' ory no cat and borla cb it i lost a llllot low end power..also i do have longtube headers on my ls1..still go w the true duals?? whats the difference in hp vs me gettin a cutout w my current setup?


    yeah i dont wanna spend money on a diff cb..but you think i wont suffer a lot from low end power loss. i mean theres gonna be like 100% air flow, lol. and im just a bolt on car...
    Do you have before and after dyno results? How do you know you lost low end power?

  15. #15
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
    Join Date
    Oct 2006
    Location
    doylestown, Pa
    Posts
    6,818

    SILVER
    2004 CTS-V

    Quote Originally Posted by Raoul-Duke View Post
    ok heres the deal..i have a 01 z28 that has a lid, lt's no cats 3' ory to a pos flowmaster cb...i waaas gonna go true duals but ive heard that due to lack of back pressure that it actually hurts power. people were tellin me unless im pushin 400+ rwhp that i should not go with true duals. bbbut i do NOT want the flowmaster robbin me power as i know it is soo i was thinkin maybe about getting an electric cutout?? what should i do? i was gonna get a pcm tune soo would that help if i were to get true duals?
    I am assuming that you are refering to duals dumped @ the axle or TD's over the axle?

  16. #16
    Member QKSLVR99's Avatar
    Join Date
    Jan 2006
    Location
    Abilene, TX
    Age
    37
    Posts
    278

    Pewter
    1999 Trans Am

    I had the same setup a few yrs back (LTs ORY with flowmaster CB and Cutout) it sounded ok but when I swapped to duals it got rid of that nasty rasp...

    As for 400+ for duals , don't worry about that

  17. #17
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,520

    98 Formula
    06 duramax

    I run LT's, ORY, and flowmaster on mine. I thought seriously about going to true duals but dumped duals are pretty damn loud. My cutout is loud too but I can close it and run through a flowmaster cb which is fairly quiet compared to most cb's. My setup works for me. The heads/cam made my car considerably louder so that's why I'm leaving my setup as is. Just less hassle from the cops. We have a pretty steep hill right through downtown and going up it with a 3500 stall would make a terrible racket with dumped duals on my car. Attention I can do without.

  18. #18
    Junior Member niterunnr's Avatar
    Join Date
    Jun 2008
    Location
    chickasha oklahoma
    Posts
    58

    white
    01 Z-28

    what are td's and ory's

  19. #19
    Member fxgs's Avatar
    Join Date
    Mar 2007
    Location
    Camp Hill, Pa
    Posts
    719

    Onyx Black
    2002 SLP Camaro SS

    When I had my SS dyno tuned, we ran it with the cutout closed and open...............with it open I picked up only 4 rwhp but 14 fl/lbs of rwt

  20. #20
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    Quote Originally Posted by niterunnr View Post
    what are td's and ory's
    TD = True dual set up. Usually a custom fabbed exhaust from headers back. You can have them dumped before the axle or have it ran over the axle out the back.

    ORY = Off road Y pipe. Headers, Off Road Y pipe and then with a cat back exhaust system.

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Headers, ORY, Catback w/ E-Cutout
    By ls1camino in forum Parts For Sale / Trade
    Replies: 10
    Last Post: 03-30-2009, 04:56 PM
  2. cutout vs catback...
    By Raoul-Duke in forum GTO
    Replies: 8
    Last Post: 09-28-2007, 07:15 PM
  3. Cutout Vs. Catback....
    By Raoul-Duke in forum GTO
    Replies: 12
    Last Post: 09-22-2007, 03:15 PM
  4. Hooker catback w/ cutout
    By 91RS355 in forum Parts For Sale / Trade
    Replies: 2
    Last Post: 11-13-2006, 07:02 AM
  5. Flowmaster Catback 3" with cutout (ebay)
    By 3rdgenfan in forum Parts For Sale / Trade
    Replies: 12
    Last Post: 10-13-2006, 08:55 PM

Bookmarks

Posting Permissions

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