[joshuaksimpson2019]

I have a 2014 BMW 328i xDrive with the n20 2.0 turbo and I changed the muffler on it and that was it just the muffler in the back that's all didn't mess with anything up front and it started making this weird like vibrating buzzing whistle noise and if you accelerate hard it's a really loud whistle I've replaced lots of things I put a new diverter valve on it I put a new charge pipe on it on cold side I put a new base gate actuator on it a new downpipe still doesn't change how it sounds it still has that same weird sound has anybody had anything like this at all

[rhenier99]

I could be wrong but if you replaced the muffler and it started right after then try looking at the muffler itself, make sure it's installed correctly and that the part is not faulty.

[joshuaksimpson2019]

Originally Posted by rhenier99

I could be wrong but if you replaced the muffler and it started right after then try looking at the muffler itself, make sure it's installed correctly and that the part is not faulty.

Well the muffler can only be installed one way and I don't think it can really be faulty negate is almost just a straight through design. Do you think the muffler being so free flowing that it could cause the noise.

[sqwinny]

if you accelerate hard it's a really loud whistle I've replaced lots of things I put a new diverter valve on it I put a new charge pipe on it on cold side I put a new base gate actuator on it

All those things could have a leak. Time to recheck all your work.