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I have an 08 g35hr AT just hit 100k miles , here’s my mods list . Stillen gen 3 CAI , isr high flow cats , isr y pipe , top speed pro 1 axle back. I have been having a slight hesitation at WOT , the car seems to choke up for a second or two and then finally catch its breath and accelerate hard. I changed the mass airflow sensors , spark plugs , checked for leaks and exhaust leaks but came up with nothing it’s still acting the same. Car hasn’t thrown a code and at the moment im pretty stumped. One thing i am thinking is that maybe the car needs to be tuned because it might be running to lean/rich? Idk any help??
 

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Could be an exhaust leak. Had the same problem after installing the exhaust that I bought from 4wheelonline. There was no crack but just a loose bolt. So, double-check all the connections and make sure all your bolts are tight.
 
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