Boosted 2014 R/T Shaker M6
That is not true. I have a 2004 Dodge Ram with the 5.7 hemi. It is not possible to install a catch can on it. To regain lost performance, and especially lost gas mileage, I have to remove and clean the throttle body about once a year.I'm betting the performance "degrade" if any, isn't even noticable.
If it was, cleaning your intake would be listed in the regular maintenance IF the build up was that bad and since manufacturers don't put a catch can on.......but it's not because it's not impacting the engine as much as some people think.
BUT.....that being said it definitely doesn't "hurt" to put on a catch can, just not as detrimental as some people think.