135i Stock muffler decel rasp?

[sprp85]

Hey all,

I've just slapped on a stock 135i muffler onto my 128i + secondary cat delete + resonator delete.

It sounds absolutely great...! I had 128i PE on it and while it sounded even better, the loudness + drone gets bored rather quickly.

Anyhow the noise caught me off-guard while stand-revving to check any leakage. It is some sort of "raspy" sound when rev comes down from say, 3000 RPM.

The sound is similar to exhaust leak / air leaking balloon / raspy noise.

The video above, stock exhaust part, is the noise that is very similar to what I am hearing.

If anyone could quickly confirm that it is normal noise, it would be greatly appreciated...

[mackeroni]

That sounds normal to me. A little burbling is what you would expect based on what you removed from the system.

Written by: Mackeroni

Edited by: Mackeroni

Sent by: Mackeroni

Thanks to everyone for your support. -Mackeroni

[swagon]

A video would definitely help, although I am not a mechanic guy to tell you whether shit's broken or not.

But here is an N52 with a 135i muffler and Performance Y-Pipe, which should be a similar setup to yours. It's pretty raspy. Sounds amazing, though.

[sprp85]

Thank you all for your inputs.

Sounds like it is indeed normal! The video swagon linked also have that distinct noise that I was a little weary about.

And yes, the more I hear it during commute, the more I enjoy the noise it makes now. It is possibly the best combo for 128i owners, noise wise.

To sum up my exhaust quest,

Noise Level Quite to Loudest:

- Stock everything (Sucks)
- Stock+Secondary and Reso. Delete (No Drone)
- PE + Stock everything (Awesome, clean sound but tad quite)
- 135i + Secondary and Reso Delete (No Drone but loud enough, yet very clean sound, lots of backfires)
- PE + Secondary and Reso Delete (Drone, massive backfires, loud as F)

[Matticus91]

Originally Posted by swagon

A video would definitely help, although I am not a mechanic guy to tell you whether shit's broken or not.

But here is an N52 with a 135i muffler and Performance Y-Pipe, which should be a similar setup to yours. It's pretty raspy. Sounds amazing, though.

Wow, damn, that does sound great!