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Discussion Starter · #1 ·
...Whats the purpose?
 

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the reson guys go with the shim kit is due to the fact if you run a large hp tune it will ask for alot of fuel and when it doesn't get enough fuel the fuel rail psi drops down and if it drops to far down it will give you a 2k rpm governer so with the shim kit it will allow more fuel thru the stock fuel rail..hope this makes sense

i had to do it on my 05 LLY and haven't had a 2k rpm governer since then..
 
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