YEP I have had the same problems here . You just insist on going with the car/truck and if that isn't allowed go to the next shop. We have a few custom shops around here. One, the pipes are guarented 10 yr. They use aluminized steel. I've had the same tail pipes on my truck for about 8 yrs now and changed the mufflers twice.My other truck they cut off every thing to the cat and started over no mufflers thats been on there a long time too.