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Discussion Starter · #1 ·
Hello,

I have read a lot regarding the upper and lower control arms as well as the mouthpiece on my LLY. I have a specific question regarding the control arms:

If I replace them with aftermarkets (I need to balljoints), will I have issues towing my fifth wheel trailer? My truck is currently completely stock and I would like to keep it that way. I do not want to level it because when I tow, the height of the truck is perfectly level. I have read that Cognito's control arms are made for leveled trucks. Would installing Cognito's arms cause bad angles due to not being leveled?

As far as the mouthpiece, I am in California and we have a visual smog check. I do not want problems with the state so I am considering not purchasing the S&B mouthpiece:
Amazon.com: S&B Filters 76-1006B Chevrolet GMC LLY Diesel Engine Turbo Mouthpiece: Automotive

Are any of you in California and have you been given any issues over running the S&B mouthpiece? If I go with the LBZ mouthpiece instead, is the eBay version acceptable?
GM Turbo Mouthpiece Inlet LBZ LLY GMC Chevrolet Silverado Duramax 98011738 | eBay

Thank you for your time!

Jake
 

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go with the cognito arms they will be fine leveld or not. and also get the AFE mouthpiece you can still hook all the factory stuff back to it
 
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