Originally Posted by vaneedendc
I've read lots of threads but can't seem to get a good idea of what is the best aftermarket exhaust & cold air intake for 6.7l Cummins with the DEF.
I don't want to do anything that'll void my warranty & just want some extra hp & ftlbs. Not interested in any tuners or chips, yet anyway.
Any advice or ideas?
Unfortunately I think that you're out of luck. You won't see any performance gains by replacing the tail section of your exhaust or replacing your intake. As previously mentioned the OEM air intake set-up is very efficient and you can't replace your exhaust system without a tuner.
If you do go with a tuner you will need this first http://www.bullydog.com/product.php?ID=472
I can't speak for the 2013's but on the 07-09 6.7's you can unplug your EGR valve to pick up a little power and fuel economy. On the 2010-2012 it's hit and miss if you can do that. Some go into limp mode while others operate just fine, either way though you will have a CEL. I picked up about 2mpg +/- by disabling my EGR...