The Diesel Stop banner

Magnaflow 5" DPF back exhaust sys.

4883 Views 6 Replies 4 Participants Last post by  powerstroker67
Magnaflow claims there is is a 29hp gain and 49ft torque gain with there 5" DPF back system. Has anyone put this on there their truck yet? Does it sound any better? can you feel a power difference?
1 - 1 of 7 Posts
I find this very hard to believe. The DPF is by far the greatest single restriction in the exhaust system. You can calculate mass flow rates at rated torque and hp levels - how much restriction improvement is required to get the claimed results?? How much does the DPF back stock system account for in the first place??

Is the claimed increase measured at clean DPF or fully loaded DPF? Why?

I think that best results would be found at clean DPF flow rates where the DPF restriction is lowest. As soon as soot starts to build up I think whatever is behind the DPF is no longer the major restriction and will not account for the same dyno results.

I call BS on this and urge manufacturers to come clean on how 'DPF back' systems are tested vs. soot load on the DPF and why. If advertised results are only seen at clean DPF levels then that means maybe 5% - 10% of the total duty cycle ???? I guess you need to regen right before you want to mash the pedal, huh? Should you pull over and let regen complete before trying to pass that slow semi?

Caveat Emptor - buyer beware. Show us the data - all of it. /ubbthreads/images/graemlins/rolleyes.gif
See less See more
1 - 1 of 7 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.