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Thread: new headers

  1. #1
    wadesemaj is offline Cadillac Owners Member
    Automobile(s): 2011 cts coupe 3.6
    Join Date
    Jan 2013
    Posts
    12

    new headers

    Does anyone know if the 3.6 2011 coupe has mandrel bent headers. I want to get more hp by letting the engine breath better. Im thinking CAI/ headers / catback. Hopefully i can dyno tune and maybe flash my chip and end up with around 360hp. What do you all think


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  3. #2
    btlfedcts is offline Cadillac Owners Member
    Automobile(s): 2010 CTS Sedan, 2012 CTS Coupe, 2015 ATS Coupe
    Join Date
    Jul 2011
    Location
    California, USA
    Posts
    70

    Re: new headers

    Try posting in the Performance Mods section. As you will find out the 3.6L DI motor does not have removable manifolds and as such cannot have any improvements made on the exhaust flow from that standpoint.

    Here is a cutaway of the cylinderhead with integrated exhaust ports shown:

    http://img715.imageshack.us/img715/6382/lfxexhaust.jpg

  4. #3
    mikesul is offline Cadillac Owners Enthusiast
    Automobile(s): 16 2.0T Perf, 8spd auto, dp, E85, tune
    Join Date
    Aug 2010
    Location
    S FL
    Posts
    810

    Re: new headers

    Thats only on the 2012 engine. The headers are detachable on the 2011 engine, but I never found anyone that offered them.

  5. #4
    btlfedcts is offline Cadillac Owners Member
    Automobile(s): 2010 CTS Sedan, 2012 CTS Coupe, 2015 ATS Coupe
    Join Date
    Jul 2011
    Location
    California, USA
    Posts
    70

    Re: new headers

    Looking into the lineage I found the following:

    www.gmpowertrain.com has some pictures to show the "Headerless" integrated designs dating back to 2010 on the 3.0L but only more recently on the 3.6L

    3.0L VVT DI (LF1) 2012 - 270 HP / 223 TQ, 2011 - 270 HP / 223 TQ, 2010 - 270 HP / 223 TQ
    3.0L VVT DI (LFW) 2013 - 270 HP / 223 TQ, 2012 - 270 HP / 223 TQ
    3.6L VVT DI (LFX) 2013 - 318 HP / 275 TQ, 2012 - 318 HP / 275 TQ

    The older 3.6 DI motor did not have the "Headerless" integrated manifold designs but is no longer in use (US Market- Cadillac)
    3.6L VVT DI (LLT) was a 2011 - 304 HP / 273 TQ, 2010 - 304 HP / 273 TQ, 2009 - 304 HP / 273 TQ, 2008 - 304 HP / 273 TQ,


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