: new headers



wadesemaj
01-28-13, 12:21 AM
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

btlfedcts
01-29-13, 09:09 AM
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

mikesul
02-07-13, 02:31 PM
Thats only on the 2012 engine. The headers are detachable on the 2011 engine, but I never found anyone that offered them.

btlfedcts
02-10-13, 12:38 AM
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,