BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > DIY Guides and Instructions > Oem exhaust modifications
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      10-20-2019, 08:02 AM   #1
Zeezu541
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Oem exhaust modifications

Hi guys I have an M140i and want to modify the oem exhaust by opening the backbox and either:
1: replacing the perforated pipe with a straight pipe
2. Welding the holes in the perforated pipe

Could anyone advise which is a better method
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      12-17-2019, 08:56 AM   #2
B58_f32
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check out pcw exhaust mods, he does this, is in milton keynes. gets good results.
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      12-29-2019, 02:57 PM   #3
Matthew_W
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Quote:
Originally Posted by Zeezu541 View Post
Hi guys I have an M140i and want to modify the oem exhaust by opening the backbox and either:
1: replacing the perforated pipe with a straight pipe
2. Welding the holes in the perforated pipe

Could anyone advise which is a better method
From what I've seen on opening them I think it would be easier to replace the pipe as welding the holes around the back might be a pain. Saying that welding a new pipe in will have similar challenge although there may be enough space to get the torch around the back. Perhaps sleeving over the pipe would be simpler, ie slit a new pipe then put the seem on the opened side only.

I bought the MPE from Cotswold in the end and was very happy with it.

My m135i is going now and I couldn't get the MPE off. I've a feeling it's the same exhaust, my standard one is kicking around my garage if it's any interest for practise? I'm a fair way, but at least same country I think.
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      01-08-2020, 06:02 PM   #4
DrGadget
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Exhaust flap solution

I took the easy and less noisy way out:
  1. Opened the exhaust valve by using such as Bimmercode/Carly for BMW or putting the car in Sports mode with engine running.
  2. Pulled the plug from the actuator, and installed a BMW dummy actuator plug (BMW OEM Part No, 18302411427) to keep the crap out.
  3. Strapped dummy actuator & wire to under-body with long cable tie.

  4. Installed wiring plug connector terminal 4 pin (BMW OEM Part No. 12527549033) to actuator valve mechanism after sealing with silicon to stop water & crap ingress.

  5. Exhaust flap stays open all the time.
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