Loud pops from exhaust

sparkplugs for sure, my car did that and i had two cracked ones. change them and you'll be good to go :)
 
see, on the way back from san antonio i heard a loud pop getting onto the highway almost like a boost coupler had come loose and i though oh ill just go and re attach it again. but none of the couplers were loose or had tears or cracks in them.
 
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