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True Dual exhaust read me. pics/and share your information.

This is a discussion on True Dual exhaust read me. pics/and share your information. within the External Engine forums, part of the LSx Technical Help Section category; Read before aksing questions about true dual exhaust. Here are some questions and answers that some of you might have ...

  1. #1
    Senior Member Zboner's Avatar
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    Post True Dual exhaust read me. pics/and share your information.

    Read before aksing questions about true dual exhaust.

    Here are some questions and answers that some of you might have if you’re thinking about true dual exhaust.

    Will I see more horse power over a Y pipe and catback set up?
    -the answer is yes, the exhaust will flow better over the Y pipe system if you are going to use the X pipe or H pipe for the cross over, the X and H pipe make the exhaust flow much smoother and has a better note to the exhaust sound.

    Can I run true dual’s over the axle?
    -Yes you can run them over the axel on the passenger side of car and out the back of the car (using the muffler of your choice)



    The system below shows use of an X pipe over the axle using moroso spiral flow mufflers that can be had for about $40 a piece.

    Will I have clearance problems with true duals?
    -the answer to this question depends on how well your shop does the install of the system, I have seen some applications that only have a few inches of clearance and scrape, while others have NO clearance problems at all. Some advice is to NOT have passengers in the rear seats when u are running a dumped exhaust being that the car will sag and can cause the exhaust to scrape the ground.

    Should I run 2.5” pipe or 3” pipe?
    -2.5” pipe can be run for applications that are producing less then 500hp, but what pipe u want to run is all up to the person getting them installed the 3” will flow a bit better but you much that much of a gain over the 2.5” system

    What mufflers should/can I use?
    -any bullet style muffler can be used, or you can opt to go with the Flowmaster 1 chambers these are referred to as “10” series delta flow race mufflers. Which in most people’s mind produce the best sound, being very deep and aggressive like the older muscle cars of the 60’s. Do NOT think since these are flowmaster mufflers that they do not flow well they are a one chamber design and used in race applications, they can handle up to 1,000hp.





    Can u run cats with a true dual system?
    -Yes u can run cats with a true dual system, if your state requires you to run them.

    What is the typical price of true dual’s?
    - Depending on the shop I have seen dumped systems run anywhere from $300-$800, and have seen duals that exit the rear go as high as $1,200. I found a shop to run and hang my pipe for $125, plus my parts were about $350 to have the set up.

    a small sound clip of my car and its true dual set up that is currently on the car, pacesetter L/T's, NO cats, 3' pipe into Flowmaster 1 chambers (10 series) dumped
    http://edigras.iweb.bsu.edu/Public/LS1/P7280188.MOV


    ***please post your pictures of your system and any experiences that you may have had or anything new that is not on the list and I will have it added on the main
    page.

    i will update this page this page as much as possible with new pictures
    Last edited by Zboner; 07-31-2006 at 08:51 AM.

  2. #2
    Likes twisty roads bene's Avatar
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    My $1135 Bassani Xhaust true duals system. The cost included install/shipment/fab some of the pipes because it didn't quite fit like it's supposed to. I'm happy about the power it gained but not the sub-par quality I had to deal w/ to get it installed. If I had to do it again... I would've spend my money on custom TDs and spend the rest on long tubes headers.







    This is the lowest point of my bassani Xhaust.



    The system came w/ 3.5" chrome tips and I opted to just throw them away. It looked ridiculous, reminded me of fart pipes and it didn't really flow well under the Z's bumper(I wish they had an option for tips for camaro/firebird). I went ahead get 2.5" stainless steel tips welded and polished.

  3. #3
    Gold Member - fadjur
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    2002 Trans Am Convertible

    zboner -- what size pipe did you use?

  4. #4
    Senior Member Zboner's Avatar
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    i went with a 3" pipe on my car(dont have pics up of it yet) because the car next summer is getting heads and spray so i wanted to get maximum flow out it

  5. #5
    We'll be back... GatorSS's Avatar
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    Zboner, where did you get yours done?

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    Ive got TRUE DUALS on the 59 vette, straight back from each shorty, real true duals,no h pipe. Also I disagree with having duals with an h pipe on an f body, YOU WILL lose HP unless your running some 500 plus HP, you need that back pressure to develope HP. This is only my opinion though and WTF do I know.
    My mods on the 99 FORMULA
    Whisper lid, K&N, B&M Short Throw, CAI, Magna Flow Exhaust, UMI torque arm, FT LT hdrs, ORY, dual cutouts, 4.11 Gears, BMR SFC, BMR MSB, BMR lower control arms, Poly motor and tranny mounts, 575/568 232/227 111 lobe cam, Taylor wires, ngk tr55s,1 10in. JL W3 for beat.

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    Senior Member ninobrn99's Avatar
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    3" all the way if dumped. 3" to x then 2.5 all the way back if going over the axle or lowered is what id suggest. Either setup will net the same gains. The 2.5" is easier to get both pipes over the axle on the pass. side. I have a few pics of different setups. Ill have to host them, then Ill post them. Ive had mine off for sometime now. I miss the sound of them, but I dont get hassled for my exhaust anymore. I may go back to duals someday..maybe.

  8. #8
    Slow'er'Ass Mr. Luos's Avatar
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    Mandrel bent true duals will NOT fit with a tunnel braced torque arm.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

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    Senior Member ninobrn99's Avatar
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    good point! thats why i dont have mine anymore spohn TA>duals

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    Slow'er'Ass Mr. Luos's Avatar
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    I still have duals...but it isn't mandrel bent.
    Gets VERY tight through the tunnel brace with 3" duals.

  11. #11
    Senior Member Zboner's Avatar
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    Quote Originally Posted by GatorSS View Post
    Zboner, where did you get yours done?


    www.ts-performance.com

  12. #12
    Senior Member Zboner's Avatar
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  13. #13
    old timer blue02Z's Avatar
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    hey zboner, can you post pics

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by 1959ls1 View Post
    Ive got TRUE DUALS on the 59 vette, straight back from each shorty, real true duals,no h pipe. Also I disagree with having duals with an h pipe on an f body, YOU WILL lose HP unless your running some 500 plus HP, you need that back pressure to develope HP. This is only my opinion though and WTF do I know.
    man i'm sorry but i've read many articles that say back pressure is a ol' hot ride b/s..and i have to agree.

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    has anyone heard anything good or bad about the texas speed true dual system?

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    Quote Originally Posted by juSStin View Post
    has anyone heard anything good or bad about the texas speed true dual system?
    i think it sounds hella nice, theres a guy on ls1sounds that has hooker lts, and TD's with bullet mufflers and it sounds really good, im actually gonna be getting the texas speed TD
    Last edited by Ws6 Love; 09-15-2006 at 08:42 PM.

  17. #17
    JOSEY FUCKING WALES! Frankthetank's Avatar
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    I had true duals on my last car.....it sounded nice....but had no room for mufflers......also it came to about an 1in and a half ovewr the axil....it was restrictive as fuck.......

    TSP Rumbler, LT's, TSP Tqr2, PRC 921 Springs, Comp Lifters, Chromoly 7.4" Pushrods, Titanium Retainers/Seats/Seals, ARP head bolts, BMR full Rear suspension

    "I could break a bowling ball with a plastic hammer in a sandbox"

  18. #18
    Junior Member shabysurf's Avatar
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    true dual side exit would be sick, also back pressure is important, and 2 x 2.5"
    in and 3.5" out y-pipe will flow just as good as a 2.5" x-pipe, do the math and don't argue this unless you have bench tested this, also magnaflow all the way.

  19. #19
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Mandrel bent true duals will NOT fit with a tunnel braced torque arm.
    I made it fit! I even have a driveshaft safety loop!

  20. #20
    Rollo Tomassee AKIRA's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    I still have duals...but it isn't mandrel bent.
    Gets VERY tight through the tunnel brace with 3" duals.
    Not mandrel bent? So you used a bender to make the duals?

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