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How to get the best flow from your y-pipe

This is a discussion on How to get the best flow from your y-pipe within the External Engine forums, part of the LSx Technical Help Section category; I decided to stay lat after work last night to ditch my old pacesetter y-pipe for this setup...

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    Member silverz28camaro's Avatar
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    How to get the best flow from your y-pipe

    I decided to stay lat after work last night to ditch my old pacesetter y-pipe for this setup


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    Member silverz28camaro's Avatar
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    The old outlet was 2 5/8 the new outlet is 3.5 in.

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    Member silverz28camaro's Avatar
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    My old dyno was 451 rwhp 380 tq with a heads cam stalled ls2 in my camaro.

    I am wanting to make it back to the dyno after this mod to see if i can top 460-470ish.

    since my old dyno I will be adding this new exhasut setup, and a fast 102 over my fast 92.

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    Moderator Firebirdjones's Avatar
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    Ya, I've crabbed about the Pacesetter Y junction for years, but it seems to fall on deaf ears. It's actually more like a "T" junction than a "Y"
    I've bought 2 of them and they were both the same. The hole for the "T" wasn't as large as the pipe itself, so there was alot of overhang and slag. I ended up cutting mine apart and opening the hole since I had it apart anyway to reposition the driver side pipe.

    What I'd be more interested in knowing with your swap is....

    1) Does that add on piece still have the Y-pipe positioned so the factory catback can still be bolted on? It doesn't appear to have enough pipe after the junction for a slip fit.
    2) Where did you find it and how much did it cost?
    Last edited by Firebirdjones; 05-20-2011 at 06:54 AM.

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    Senior Member Z28_Driver's Avatar
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    I'm interested in seeing how this comes out.

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    thats nice un less u have a tq mount going tnere.

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    Quote Originally Posted by blackbirdbrain89 View Post
    thats nice un less u have a tq mount going tnere.
    was just thinking the exact same thing, don't mean to derail thread but is it feasible to not reinstall the cross member to give the exhaust more room or is it structurally necessary?

    nice exhaust work BTW

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    Member silverz28camaro's Avatar
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    Quote Originally Posted by blackbirdbrain89 View Post
    thats nice un less u have a tq mount going tnere.
    I don't have any planes to mount a tq arm any where else. I have a edelbrock tq arm with a bmr relocation crossmember that I can remove with no issues from the exhaust. This setup has proven good, on street 245 all season tires I cut a 1.50 60', and on drag radials 255 mt et streets I got a 1.42 out of it.

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    Member silverz28camaro's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    Ya, I've crabbed about the Pacesetter Y junction for years, but it seems to fall on deaf ears. It's actually more like a "T" junction than a "Y"
    I've bought 2 of them and they were both the same. The hole for the "T" wasn't as large as the pipe itself, so there was alot of overhang and slag. I ended up cutting mine apart and opening the hole since I had it apart anyway to reposition the driver side pipe.

    What I'd be more interested in knowing with your swap is....

    1) Does that add on piece still have the Y-pipe positioned so the factory catback can still be bolted on? It doesn't appear to have enough pipe after the junction for a slip fit.
    2) Where did you find it and how much did it cost?
    http://www.mandrel-bends.com/catalog...04ss-1170.htm

    This is where I got most of my parts....I be you could match it to your factory exhaust with the right reducers. the aftermarket slip fit y pipes are designed to fit the factort catback for easy installation, but the problem is a smaller y pipe....if you want the best possible flow you will need to put some time/effort/ and money into it...

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    Member silverz28camaro's Avatar
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    I just thought I would share my dyno gains with this new setup....FINALLY went to the dyno monday.....SOLID gains



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    Member silverz28camaro's Avatar
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    Yes it was 464 rwhp PEAK vs the last 451 rwhp PEAK, but look under the peak area, up 20ft.lbs from 4,500 to 6,600 rpms!! this thing is going to fly!! feels a ton stronger on the hit....I'm looking for low 10's!!!

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    thats the best looking y-pipe setup ive seen. good job

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    Would you sell thus y pipe

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    Moderator Firebirdjones's Avatar
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    You also mentioned doing a FAST 102 setup over your FAST 92 at the same time.

    Is this gain with just the Y-pipe or is this both the intake and Y-pipe done at the same time??

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    Member silverz28camaro's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    You also mentioned doing a FAST 102 setup over your FAST 92 at the same time.

    Is this gain with just the Y-pipe or is this both the intake and Y-pipe done at the same time??


    Yes, i also went from a very well ported fast 92 to a fast 102 cleanned up/port matched....but i stilll bet most of the power 15-18 ft.lbs came from the y-pipe. I have seen a few fast 102 vs 92 and a 5-8 rwhp/tq is most you will see. Another guy on another forum did the same exhaust setup I did but also with 1 7/8 headers vs 1 3/4 headers..his graph looked very similar to mine but he gained more tq, closer to 30ft lbs....I still have the 1 3/4

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    Nice gains! I know this is a old thread but solid info and worthy of the bump!

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