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Y pipe back

This is a discussion on Y pipe back within the External Engine forums, part of the LSx Technical Help Section category; I have a 2k ws6 with obx lt and resonators for cats. Currently i have lm1 exhaust. Not wondering about ...

  1. #1
    Member GNICTRY's Avatar
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    Question Y pipe back

    I have a 2k ws6 with obx lt and resonators for cats. Currently i have lm1 exhaust. Not wondering about sound (yet). What "y pipe back"-dunno if thats the right term- would give me more hp due to back pressure?

    thanks

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    If your only asking about y pipe back and u have stock manifolds im taking it and stock y pipe with LM exhaust, then just a y pipe will not improve much for sound or hp gains. Just leave your stock y pipe until your ready to do headers unless you have a hole in ur y pipe?

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    Your dealership guy konigandy6's Avatar
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    Quote Originally Posted by GNICTRY View Post
    I have a 2k ws6 with obx lt and resonators for cats. Currently i have lm1 exhaust. Not wondering about sound (yet). What "y pipe back"-dunno if thats the right term- would give me more hp due to back pressure?

    thanks
    I have the exact same set up...except LM II and it is awesome sounding and has awesome power.

    2008 Z06 - Velocity Yellow - OEM

    2017 Silverado Z71 5.3 - OEM

    2002 Z06 - Electron Blue Metallic - D1 - E85 - 701 rwhp 687 rwtq **sold**

    2002 Z28: M6 NBM - cam and boltons - 396rwhp 357 rwtq **sold**

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    Member GNICTRY's Avatar
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    I have headers...obx lt...i dynoed at 335hp 337tq..was wondering if the lack of back pressure would lower the numbers. Thats why i am asking about changing the ypip back

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    You may see a slight decrease in rwhp with a stock y pipe but not a huge gain with replacing it. To answer your question yes it would be recommended to replace your y pipe to allow more flow but like I said the gains will be minor.

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    Member GNICTRY's Avatar
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    Quote Originally Posted by miller456 View Post
    You may see a slight decrease in rwhp with a stock y pipe but not a huge gain with replacing it. To answer your question yes it would be recommended to replace your y pipe to allow more flow but like I said the gains will be minor.
    what about lm1 muffler compared to others that create more pressure?

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    A lot of performance mufflers produce similar hp numbers but i dont have dyno proven quotes or sites for you, youd just have to search mufflers and see what gains people have made using different brands. I would recommend just replacing your y-pipe and leaving your aftermarket LM muffler and using your money elsewhere. I personally have Corsa but just ordered pacesetter ceramic LTs and y pipe and after I install and get numbers ill definitely post them for you.

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    k...this is what i havethen i have lm1...

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    Looks good, just leave ur lm and put the savings elsewhere. Im not putting cats back on mine so we will see how that plays out.

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    Your dealership guy konigandy6's Avatar
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    I think I'm getting at what you are saying. Reduced back pressure wont hurt your hp numbers, the only thing it will do is lower your bottom end torque. I had a 02 silverado that I put headers on and mid-top range it was a monster, but taking off from a dig took a little more throttle. On my camaro with the OBX and ORY and LM2, I have noticed no loss in power at all. So I think you are safe with your set up as is.

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    Member GNICTRY's Avatar
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    thanks guys!

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    Senior Member INMY01TA's Avatar
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    335/337 seems about right for those mods. Change the catback if you're unhappy with the sound, otherwise leave it.

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    Member GNICTRY's Avatar
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    Quote Originally Posted by INMY01TA View Post
    335/337 seems about right for those mods. Change the catback if you're unhappy with the sound, otherwise leave it.
    i have a ls6 intake, slp lid and maf, obx lt and lm1 as far as my mods...still sound right?

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by GNICTRY View Post
    i have a ls6 intake, slp lid and maf, obx lt and lm1 as far as my mods...still sound right?
    yes.

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    Your dealership guy konigandy6's Avatar
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    I have almost identical mods....I would love to get both cars together and see if there actually is a difference in LM1 and LM2 mufflers. I love how mine sounds, and I get a lot of compliments on it.

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    Quote Originally Posted by konigandy6 View Post
    I have almost identical mods....I would love to get both cars together and see if there actually is a difference in LM1 and LM2 mufflers. I love how mine sounds, and I get a lot of compliments on it.
    that would be sweet

    here is me going down the track

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    Your dealership guy konigandy6's Avatar
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    Nice...I do believe they sound pretty identical.

    Is that an A4?

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    Quote Originally Posted by GNICTRY View Post
    that would be sweet

    here is me going down the track
    Which night was that? was that since I saw you run?

    That thing still hit second hard at WOT

    How is it feeling to you at part throttle now?

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    Member GNICTRY's Avatar
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    Quote Originally Posted by konigandy6 View Post
    Nice...I do believe they sound pretty identical.

    Is that an A4?

    yes a4

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    Quote Originally Posted by Frost View Post
    Which night was that? was that since I saw you run?

    That thing still hit second hard at WOT

    How is it feeling to you at part throttle now?
    that was before, the weekend after you tuned it. Yep second is sweet at the track! Feels better get hard sometimes...the 1st shift feel like it did before you tuned it. Are you going to the track sat 17th? If so can you bring your computer to make sure i am not running rich...llight went off and o2 are changed-pass. one was wrong....
    Last edited by GNICTRY; 11-16-2007 at 10:32 AM.

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