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Just to play devils advocate, almost everyone and all the reviews on American muscle are positive why would that be?
Typically the reviews are dead on for AM
When I wash and detail my car it feels faster and runs better, but it's not and doesn't its all perception
 

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Placebo effect everyone is aware of it.

The reviews state gains and I don't see why it would say 10hp gain if its a load of ****. I'm swayed off buying it but I don't see why half people swear by it and say its a great bang for your buck and half say they are a waste.
It does give you a dyno proven 3-5 hp,
I saw someone post a b4 and after, for 60 bucks just get the thing but don't tell anyone
 
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