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Driver's side exhaust at the cat

This is a discussion on Driver's side exhaust at the cat within the Camaro / SS forums, part of the Vehicle Specific category; Has anybody replaced the factory flattened piece that is bolted to the cat with a ROUND section and did it ...

  1. #1
    Junior Member Rikitikitavi's Avatar
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    Sunset Orange Build#8450
    '02 Camaro SSM6, '97 Z71

    Driver's side exhaust at the cat

    Has anybody replaced the factory flattened piece that is bolted to the cat with a ROUND section and did it help?
    Last edited by Rikitikitavi; 04-26-2008 at 02:31 PM. Reason: mis-spelled

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    Member kev70ss's Avatar
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    Are you talking about the y-pipe? If so SLP makes a replacement y-pipe that is round, but i dont think your going to gain a lot of power

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    Junior Member Rikitikitavi's Avatar
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    Sunset Orange Build#8450
    '02 Camaro SSM6, '97 Z71

    Thanks, not sure if it's called the y pipe but it is flattened. It is one of the arms connecting to a y. It looks as if it would help reduce restriction. I was planning on putting a cutout just past the y on the passenger side. Another option I saw somewhere is to place a cutout just before the entrance on the muffler. I found exhaust cutouts on Jegs but was unsure of the diameter. It looks like 3 1/2" past the Y.

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    Moderator Firebirdjones's Avatar
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    I tried it and gained nothing. Car was otherwise pretty stock at the time.

    Just a little bit of added info though,,,,the factory setup is on 2 1/4 inches,,,the SLP setup increases this to 2 1/2 inches. It's a pretty well made piece,,,just didn't yield anything at the track though.

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    Junior Member Rikitikitavi's Avatar
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    Sunset Orange Build#8450
    '02 Camaro SSM6, '97 Z71

    Thanks man. What about the pipe just past the y? is it 3 inces or 3 1/2 inches? I was going to buy a cut out from Jegs.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Rikitikitavi View Post
    Thanks man. What about the pipe just past the y? is it 3 inces or 3 1/2 inches? I was going to buy a cut out from Jegs.
    Probably 3 inch. I have seen some that actually measure 2 3/4 inch. If the car still has the stock system this may be the case. Most of your basic aftermarket catbacks are 3 inch,,,unless someone put a mufflex system on there,,,,in which case comes in 3 1/2 and 4 inch.

    A quick way to check is a poor mans dial caliper. Take a crescent wrench if you have one large enough,,,open it to fit snug around the diameter of the pipe and then check the opening with a tape measure

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    Junior Member Rikitikitavi's Avatar
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    Sunset Orange Build#8450
    '02 Camaro SSM6, '97 Z71

    Thanks

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    Exalted Cyclops 67CamaroRSSS's Avatar
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    Quote Originally Posted by Rikitikitavi View Post
    It is one of the arms connecting to a y.
    That's why it's called a "Y" pipe.

    The "I" pipe, or "inline" pipe that connects the Y pipe to the transverse muffler is generally where you'd put a cutout if you are using a mostly stock exhaust system. Depending on year, it will add up to ~10 rwhp/15rwt when its open (at least it did to mine when I did it).

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    Member fxgs's Avatar
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    Quote Originally Posted by 67CamaroRSSS View Post
    That's why it's called a "Y" pipe.

    The "I" pipe, or "inline" pipe that connects the Y pipe to the transverse muffler is generally where you'd put a cutout if you are using a mostly stock exhaust system. Depending on year, it will add up to ~10 rwhp/15rwt when its open (at least it did to mine when I did it).
    When I had my SS dyno tuned, I picked up (only) 4 rwhp but 14 ft/lbs of rwtq with the cutout open.

  10. #10
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
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    Quote Originally Posted by fxgs View Post
    When I had my SS dyno tuned, I picked up (only) 4 rwhp but 14 ft/lbs of rwtq with the cutout open.
    I started with a stone stocker which dynoed at 306/323 at the wheels. Added a Volant CAI and a QTP 3" electric cutout. With the cutout open it dynoed ~313/338 so for me it was a good investment. I then added a set of QTP LT's with a custom 3" Y-pipe. I then laid down 343/357 with the cutout open but it was only a 2hp/4lb-ft gain over it being closed. I now have LT's & TD's. I haven't dynoed it this way but I did gain .05 sec and 2 mph in the 1/4 mile over the previous combo.

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