I've installed and run both the MAC 1-5/8 headers and the BBKs. IMHO, hands down BBK. They are thicker gauge, thicker flanges, and fit like a glove. Never had a single issue with BBK. I've had problems with 2 sets of MAC longtubes.....with fitup mainly.
BTW, I currently run the BBKs with offroad and the Force II (3-chamber) system and it is music to my ears. Mufflers are truly sound quality devices on most street cars. And one would be hard-pressed to pick up a sound quality difference between longtube header manufacturers...
Just my 2 cents. Happy holidays!
- Kevin
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