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  1. 01-08-2007, 09:06 AM #1
    MikeSomething
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    Pewter Metallic
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    MAC Headers and ORY

    Hey guys, just ordered me some HTS Coated MAC mid-tubes w/ the ORY. They advertise 40hp & 40lbs trq. I really don't think I'm gonna get nearly as much as that. I just thought it was cool that the way the Y pipe goes into the collectors kinda shape it as long tube headers w/ out loosing clearance. Anyone have em? Thoughts?
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  2. 01-08-2007, 01:20 PM #2
    SSwt00SS
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    '18 CTS-V
    '13 ZL1

    just curious why you went w/a 2.5" mid-tube/y-pipe combo and not LT's/3" y-pipe. you will loss some low end TQ w/a 2.5" vs. a 3" combo. I originally bought exactly what you did, but realized my mistake and sold them (i'm not saying yuo made a mistake). the end of the y-pipe to i-pipe is 2.5" not 3", so if you have a 3" cat-back, you will need a filler piece tubing from 2.5" to 3" where they connect.

    i went with the Ebay Stainless Steel Lt's and Pacesetter 3" ORY...
    2018 CTS-V: °°668rwhp/658rwtq°°
    2013 ZL1: °°590rwhp/576rwtq°°
    "Never argue with an idiot. They drag you down to their level, then beat you with experience."
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  3. 01-08-2007, 01:53 PM #3
    danziger
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    Le Mans Blue
    2004 Z16

    I liked my MACs a lot. They aren't LTs...they're mid-length headers. EASY install (both dropped in from the top after removing plugs, coil-packs and pass-side valve-cover) and great clearance with good power. You will lose some TQ gains versus LTs, but up top it will be pretty close. Make sure the welds are ground down and I personally like the "collector mod", which eliminates the ball-flange. Using GM cats in the Y-pipe, my MACs gained 18-20rwhp...
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  4. 01-08-2007, 04:04 PM #4
    nhraformula
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    black
    2000 nhra edition formula

    macs are some really good headers and make just about the same power as LTs
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25
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  5. 01-08-2007, 04:20 PM #5
    MikeSomething
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    Thanks for the input guys! I went w/ them cause I was concerned more or less about clearance issues.
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  6. 01-09-2007, 05:52 AM #6
    MISSMYZ
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    Hugger Orange
    1999 Camaro Z28

    OK. School me here. I'm in the process of installing some MAC mid length headers with MAC Off Road Y pipe. Is this NOT going to fit into my SLP Loudmouth exhaust? Do I need some sort of a transition now?
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  7. 01-16-2007, 02:43 PM #7
    danziger
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    My MAC Y-pipe went to my SLP Loudmouth with no issues...
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  8. 01-16-2007, 03:08 PM #8
    SSwt00SS
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    '18 CTS-V
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    good news! now, how do you like the sound and performance...?
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  9. 01-16-2007, 04:50 PM #9
    INMY01TA
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    2001 Trans Am (sold)

    I had Macs on my car for like 4 years. My Mac y pipe hung pretty low and I had worse clearance with them than I do with my current long tube set up. Powerwise they were pretty darn close. Long tubes sound less raspy tho.
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