Cold Start with Catless downpipe

oczko98 · 04-17-2023, 05:22 AM

Hello,
Is that normal sound with Catless dp on cold start? N20. 30-50 seconds after, the sound is normal.

I have seen people disable the cat warming function and the noise goes away.
Will cold start delete help with mettalic rattle? Cold start sound is tinny and sounds like it leaks (Probably wastegate).

https://youtube.com/shorts/NKmCOilmw6k?feature=share

harkes · 04-22-2023, 04:44 AM

I do hear a "tinny" kind of sound but in general sound alright to me. Once fully warm how does it sound?

oczko98 · 04-22-2023, 04:47 AM

Quote:

Originally Posted by harkes

I do hear a "tinny" kind of sound but in general sound alright to me. Once fully warm how does it sound?

It rattle under acceleration but I think its just rasp sound and maybe some wastegate rattle. Had a problem with midpipe clamp where it just leak..

04-17-2023, 05:22 AM	#1
oczko98 Private 16 Rep 81 Posts Drives: F30 328i 2012 Join Date: Dec 2021 Location: Poland iTrader: (0) Garage List 2012 F30 328i [10.00]	Cold Start with Catless downpipe Hello, Is that normal sound with Catless dp on cold start? N20. 30-50 seconds after, the sound is normal. I have seen people disable the cat warming function and the noise goes away. Will cold start delete help with mettalic rattle? Cold start sound is tinny and sounds like it leaks (Probably wastegate). https://youtube.com/shorts/NKmCOilmw6k?feature=share
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04-22-2023, 04:44 AM	#2
harkes Colonel 1086 Rep 2,369 Posts Drives: M135i, E39 M5, NSX and AE86 Join Date: Apr 2014 Location: Xiamen, China iTrader: (0)	I do hear a "tinny" kind of sound but in general sound alright to me. Once fully warm how does it sound? __________________ M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost (A Dane in China)
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