No problem with this TTI system,worth every penny.Also,most muffler shops can't mandrel bend 3" pipe.I have a friend that had a local shop put 3" on a 64 Polara,both sides from the collector back are in three section welded together.There are some good shops but most around here wouldn't touch anything I own.Try and find a muffler shop that can duplicate TTI,I doubt you'll find one.