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try checking your exhaust manifold gasket... i know it shouldnt be bad but you never know. when the engine has been setting for a while and is cool take a can of starting fluid and turn the truck on and spray around where the gasket is and if the motor revs up a lil then you know the gasket is bad and has a leak...
 

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it needs to be cool because if its hot when you spray it you could catch your engine on fire. the exhaust manifold (header) will be on the sides of the motor and your spraying between the heads and the header.

---------- Post added at 03:07 PM ---------- Previous post was at 03:06 PM ----------

yes you should be able to hear it since you have an aftermarket exhaust
 
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