I had a quote from my repair shop of $1000 to replace catalytic converter on my 1998 Astro. Purchase Magnaflow for $120. Shop installed for $125, reset computer and passed inspection in the Houston Texas area with some of the strictest emissions standards in the US. Can replace it 3 times and still be within the original quote. So in was definitely a bargain if it lasts more than a year it will have been a very good one.
Sound isn't strong enough.
I was considering Flow Master 40 series but was told by AutoAnything rep. they didn't have a Cat back system. He recommended Gibson and that it's better quality product, has a better sound and quiet in the cab. It sounds stock which disappoints me. I wanted a deeper, throatier sound.