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Truck not taking off right????

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I have a 2009 silverado 5.3l if that matters.. It seems like the throttle response is acting up.. I can take off, slowly push the petal down and it will go down a good 2-3" before it will finally will take off, it doesnt gradually take off it really takes off almost like im kickin it down... I just got a flowmaster 40 series muffler on it last week and it ran fine for the first 4-5 days and now its doing this... Yall think its the exhuast back pressure or throttle response or????? Truck only has 1500 miles on it...

Also does a muffler void my warranty?

Thanks
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I'm not sure about this but didn't flowmaster hurt performance?

Try a Blackbear tune
 
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