Originally Posted by banej
Yesterday I put in a new muffler Magnaflow 12158 and it sound great. The only problem is I think it spends more gas now. Does anyone notice their gas milage go down after installing a new muffler? This would suck especially now with the gas priced right below $5 a gallon.
No, I just put Magnaflow catback Muffler 14805 on mine and actually getting about 2 to 3 more miles per gallon
depending on my driving