Yeah I have ran flowmasters before and they do sound pretty good at first and then they just go to shit after abit. LolI have a single in, dual out 70 series on my 6.0, and it sounds great. It rattles like coffee can full of washers after only 2 years, which I'm pissed about, but otherwise sounds good.
If you live where there is salt you are lucky if they last 2 years before rusting and falling off.
When we bought my wife's Tahoe it had a flowmaster and from the time the previous owner put them on to when it fell off it was right at 2 years, I put a magnaflow on it and I am not worried about it at all anymore.
Is the 70 series pretty quiet?
I am hoping it tones it down abit over the magnaflows.
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