Weird question about exhaust tone
4" MBRP turbo back cat delete exhaust installed awhile back:
When I start my truck up when it is cold the immediate exhaust note is quite deep and loud. After a few seconds (up to 6 or 7 depending on how cold it is) something changes and the engine makes a different noise and the deep tone in the exhaust is gone and replaced with more of a hissing air sound. If the truck is already warmed up and I start it up the deep tone changes to the hissing sound quite quickly (1-2 seconds).
Is this normal?
Can anyone explain?
stock except for K&N and exhaust
did this from day 1
sounds completely different when I step into it going down the road though
2004 F350, Crewcab, 4X4, 6.0L Diesel, Shortbox, 285/75R16, K&N FIPK, 4" turboback MBRP cat delete S.S. exhaust