I have a 95 4x4. I removed the cat & muffler and put on a WALKER muffler and brought the exhaust out in front of the rear wheel. Love it - sounds great but I have a smell when the motor is hot that comes threw the heat vents. (IT SMELLS A LITTLE LIKE PROPANE). WHEN I RAISED THE HOOD IT WAS COMING FROM AROUND THE TURBO. What would get rid of this smell? Could the turbo need a cleaning?