Exhaust sound after engine's off - DPF/DOC delete

[joshcdsi]

So I've had the 210hp Spartan tune running for a while, using a straight DPF/DOC replacement pipe and the stock muffler. I get the whooshing sound everyone talks about, but sometimes after I shut my truck off I continue to get a sound that almost sounds like the turbos are taking forever to spool down. Is that really what that sound might be? Sometimes it lasts a good 5-10 seconds.

Josh

[Raul@Stealth Automotive]

yes that exactly what it is... its just your turbos spooling down

[keving]

Actually you are running a full straight pipe system. The factory "muffler" is fake. You can install a real muffler and you will notice the exhaust sounds much deeper and the whistle and air noise from the turbos is greatly reduced.

[19558077]

HEY GUYS. I HAVE AN 02' I CUT THE END OF THE DOWN PIPE OFF UNDER THE CAB AND PUT 4" FROM THERE BACK. IS THERE A WAY TO ELIMINATE THE TAILPIPE NOISE WITHOUT EFFECTING THE FLOW?

[Raul@Stealth Automotive]

Originally Posted by 19558077

HEY GUYS. I HAVE AN 02' I CUT THE END OF THE DOWN PIPE OFF UNDER THE CAB AND PUT 4" FROM THERE BACK. IS THERE A WAY TO ELIMINATE THE TAILPIPE NOISE WITHOUT EFFECTING THE FLOW?

not really... you can put a high flow muff on it.. but you will still get the noise...

[SouthTexasDiesel]

Yep that's completely normal. You should hear it spooling down with stacks, loud and can take up to 15 seconds to stop. I get people all the time asking me what that noise is when I stop to get diesel.

[hose4ya]

Anyone running the quad tip Monster from Banks?

[hose4ya]

dual quad tips I forgot to say