KC Maxx Performance
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Professional EFI tuning and Dyno Services
06/07/2026
6.6L gas engine, 87 octane, Stock vs Tuned, nice gain for a tow rig.
Do you have a tune on your gas tow rig? 6.0, 6.6, and 8.1 always have low end torque left on the table over GMs factory programming.
05/06/2026
Oof, drove a little too long on this one 😬
04/09/2026
“They say 'loud pipes save lives”, but apparently, the wrong ones just kill your horsepower. 📉
Check out the difference on this Dyno sheet. When we talk about a 'Flowmaster disaster,' this is exactly what we mean. Swapped out the restriction and picked up 22 hp and 38 ft-lbs of torque. Turns out this engine wasn’t slow, it was just trying to breathe out through a straw.
03/26/2026
KC Maxx is closed  for spring break from March 26- April 5th
Go to our website to book appointments while we are gone. 
03/12/2026
Book appointments soon if you want in before the end of March.
Ever seen a melted lifter tray? Yeah me neither until today.
02/04/2026
While I am off at sick week, the boys back at home are wrapping up this LSA Ctsv Magnuson, 2650 install cam kit fuel system upgrade, plus another truck AFM repair. 
If you are installing aftermarket parts, make sure the installer understands what it takes to actually complete the combination so that you don’t end up paying to redo the job less than a tank of fuel later.
Wrapping up another AFM repair job, temperature is too cold for you to work in your garage. Give us a call and we will install your kit that you’ve already purchased or you can go with one of our packages.
01/02/2026
Starting 2026 off with another torn down 6.2L getting a cam job and lifter repair done.
How many miles does your AFM/DOD/MDS system have on it?
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Address
1602 Little Avenue
Grandview, MO
64030
Opening Hours
| Monday | 8am - 6pm |
| Tuesday | 8am - 6pm |
| Wednesday | 8am - 6pm |
| Thursday | 8am - 6pm |