i have had a lose of power and i thought it was the cat. so i took it to the muffler shop and the said my cat is right against my frame, it rattles a bit. my car was in a accident where the guy hit a fire hydrant but it was repaired. so i guess the cat was somehow moved or i had frame damage. the car was safetied and passed body integritiy after it was repaired. so i'm taking it to the dealer tommorrow morning. so what should i ask for... i want my car scanned and i want to know why i have the loss of power and what i should do about my cat. any suggestions?