Example of a Series 50G backfiring 

This sound like our old New Flyers C40LF's CNGs which they have retired..But damn..That is One hell of a good backfire 10/10!

passed out twice hearing this

0:15

Not a backfire.... It's the blowoff valve dumping the turbo pressure.

awesome!!

At Least Metro Didn't Replace Some 2000 to 2005 Nabis 40 LFWs With Cummins ISL-G. Unlike Octa Replaced Detroit Diesel Series 50Gs with Cummins ISL-G in 2009.

Apparently, it's not backfiring. Oh well, it's not like it's bad. I miss the Series 50G C40s.

That's not backfiring. Backfiring sounds like a gun shot. This is the blow off valve for the turbo

This is NOT backfiring damn it! That's compressor surge and if you keep doing that you will destroy the turbo

Once again more people calling a blow off valve a backfire. Smh

Christ that turbo sounds like it's a sucking and slurping

Interesting. That's not like any backfire I've ever heard...