I'm curious to know the differences between these two mufflers......
differences as far as sound and performance go
my setup i guess would be long tubes, no cat, 2.5" to the back, single input/single exit
Which will be louder at idle/low RPM's?
...Higher RPM's?
which flows better?
Thanks,
-Chris

 

Either of the two will meet the objective that you want. Dynomax mufflers tend to be on the quiet side which some people desire. All aftermarket mufflers flow great but the aerochamber is on the higher side. There are flow charts out on the web somewhere so you can judge for yourself. However, any muffler you choose will be just fine.

 

I assume you are talking 2.5" duals to the back. If not I would use a 3" minimum for a single exhaust. I know the Dynomax Ultraflow is a good muffler. Allen

 

I've been told that 2.5" is what I should use, that 3" would hurt my low-end power....
I thought that there really wasnt such thing as TOO much flow, but its what i've been told...
my origional plan was 3", but i dunno
and it'll be single, not dual exhaust

 

Single 3" is what you want. It can support 150hp to 450hp. If you go too big on exhaust size you can reduce scavaging which slows down the flow and can hurt performance. however, you won't have this problem with a 350 and a 3" system.

 

Someone is giving you bad advice. Go with the 3 inch system. See the chart below from Dynomax. Magnaflow has a similar chart. These are the people who make exhaust systems and have done a great deal of dyno testing. Allen