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see in my situation, i took the cat off (unbolted the clamps and took it out (and it was a $%*@! sucker to get out)) that way if i have to go to the stealership, i can put it back on... I took the cat off ran the truck for a week and then took the muffler off. I personally didnt feel much difference in the seat-o-pants meter, i didnt have guages yet so IDK about egts but i seen mileages go up about 2-3 mpg.. running 65 down the highway... taking the muffler off i felt a lose in midrange power.. and it was obnoxiously loud.. i put the stock muffler back on til i find a more free flowing muffler
 
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