MIL cause rich condition?

LaserSVT

Got FB banned again for saying nards
Founding Member
Nov 29, 1999
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Just wondering, now that I have a new exaust and new o/r h-pipe when shifting a high rpm or WOT fron 2nd to 3rd i get a muffled pop through the exaust (sound like driver side but cant stick my head out the other window:rlaugh: ) and was told it was because it is rich. Will the MIL cause this since I have not recieved my MIL eliminators yet, hope they come soon I ordered them a week ago:bang:
BTW it is a Flowmaster American Thunder cat back with BBK O/R/ H-pipe and stock manifolds.