I have not installed mine, but I have talked to several people that have and they say that it does work a little few changes, but everything helps.. I know that I had one on both my chevy truck and one was the 6 liter motor and it helped... I have one here that will go on the new H2 so I will let you know...
They are suppose to work and will work even better with cold air intake and programmer along with exhaust and headers...
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