I currently have a set of MAC's (unequal shorties) and I haven't had a problem. The coating just sucks.
I also have a set of BBK long tubes that are about to go in. Just by looking at the two, I can tell the BBK's are much better quality. I would suggest NOT getting chrome. Chrome holds a lot of heat. I would recomend getting the ceramic coating on them. They "look" chrome but they aren't. It disapates heat better and will make the headers last longer. Just warning you, ceramic coating is very expensive. I paid 400 for my long tubes (with my discount).
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