Cylinder deactivation with aftermarket exhausts

[timnohio]

I have a MBRP dual side exit and the cylinder deactivation in normal mode drives me crazy. Feels like it's missing. So I switch it to sport mode.
I guess I'll have to get used to the CD because 90% I'm conscious about gas mileage, hoping to see 20 mpg (mostly city driving)
In sport mode I get around 16-17 mpg.

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[Mailman]

Are you saying your system didn't come with a resonator? I just went back to the MBRP site and some don't have a resonator. Mine had a resonator and a straight pipe. I just did my first oil change and my mechanic/buddy said he can hear me coming a block away!! For now I left it in. My system is #S 5211304. Look at the picture on the site.