is the flowmaster 40 series muffler a 2 chamber or 3 chamber muffler? what about the 50 series? a local garage told me a 3 chambered muffler would be best for my 4.3L v6. what would be the difference if i put a 2 chamber or 3 chamber muffler? i want power, but i want it to be loud too.

Somone correct me if I'm wrong but....
40 series-2 chamber-very loud and deep
50 series-3 chamber-loud and deep
would think the 40 would give you more power having less restriction

Emmitt, yes you're are correct. 40-series has the least restriction of the Flowmaster line.
One thing to think about though.... it will be loud INDIDE the truck as well as outside if you go with a 40-series.

Even the 50-Series that I run has a loud drone noise between 1800-2200 when you lug the motor.
At idle, it's awesome, WOT is even better , but that drone noise can be annoying if you have people in the car (Wife, Girlfriend/Boyfriend, kids, etc)

Just something to consider.


ALL FLOWMASTER Muffler Specs (http://www.flowmastermufflers.com/cgi-bin/flowmaster/mufflers.html)

40-Series Specs (http://www.flowmastermufflers.com/pdfs/40seriesO.pdf) <-- PDF File
50-Series Specs (http://www.flowmastermufflers.com/pdfs/50series.pdf) <-- PDF File
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MY 40 series is great sounding outside. Inside, it kills me!! When it was first isntalled it wasnt bad at all, now, 2 years later, its frickin' loud inside.

my local chevy dealer said that the 3 chamber muffler would be the only muffler that wouldn't affect my warranty, but i want a 2 chamber. is that bullshit or what?

Well I would go with the 3 then (like your gonna choose to get you warranty voided) but like jeverett said it's gonna get annoying after a while, plus your not going to be able to tell a power difference between the 2. Also you don't want it being too loud being a v-6, just give it a little depth.
The one on mine realy sucks b/c you can barely hear it but I guess that's good with a fam. and all.