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Looking to purchase a jacfab intake spacer , throttle body spacer and overkill tune. Please advise. 2012 Chevy Impala lt
 

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My experience has been the factory has them pretty well dialed in already. For the money you spend, you will gain little. After adding Trifecta Tune and K&N system I ended up with harsh shifting, engine noise [K&N caused noise] and constant check engine lite codes. Removed systems and now runs good and shifts fine. SAVE YOUR MONEY.
 

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2015 Impala 2LT LFX
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Some mods will help but most of the tunes that are available by Overkill and Trifecta cause issues. I had the overkill tune and had hard clunking shifting so I found a local tuner and got an actual Dyno done. The tuner physically Dynod it and went through the previous tune and they discovered it was all out of whack with timing and shift points. Now it runs at full potential and smoothly. My mods did also show to make some power over stock.
 
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