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      03-13-2018, 06:58 AM   #1
Manivxr
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435d exhaust conversion to 440i twin exit

Hi folks I need some advice
I managed to pick up s 440i back box to convert my 435d twin pipe to dual pipes.
I note on the 440i back box there is a exhaust flap which is closed on one of the pipes.

So the question is that does my 2015 pre lci 435d have the exhaust connection and software to open the flap in sports mode?
Secondly if it doesn't how do i open the flap and keep it open?

Cheers
Mani
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      03-13-2018, 08:23 AM   #2
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Only a actual 340/440i will have the wiring for the valve.

To open it you just have to manually move the butterfly valve to the required position, or apply 12v across the motor and it will drive open.

The valve will stay in its last position.
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      03-13-2018, 08:45 AM   #3
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Got it. Cheers.
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      03-13-2018, 08:51 AM   #4
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does anyone know if I move it clockwise to open the valve or anticlockwise
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      03-13-2018, 12:24 PM   #5
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Quote:
Originally Posted by Manivxr View Post
does anyone know if I move it clockwise to open the valve or anticlockwise
You are best to unscrew the control box and remove it. The exhaust fitter will apply a spot weld to keep the flap open. That's what mine did.
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      03-13-2018, 01:40 PM   #6
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Quote:
Originally Posted by Steve_M_Sport View Post
You are best to unscrew the control box and remove it. The exhaust fitter will apply a spot weld to keep the flap open. That's what mine did.
Cheers mate. relative easy to do. May just secure with a wire in mean time.
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      03-14-2018, 05:37 AM   #7
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Interested to know how easy the exhaust change was.

Interested to know how easy fitting twin pipes was eg was there an existing support bracket both sides or did you have to add one ? Also where did you source 440i back box, cost etc.
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      03-14-2018, 05:50 AM   #8
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just go custom like mine...free flowing no flaps... and bigger than 440 3.5 inch tips
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      03-14-2018, 05:54 AM   #9
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....
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      03-14-2018, 06:13 AM   #10
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Agree with Lee. Just go custom.



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      03-14-2018, 07:30 AM   #11
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Agree with Lee. Just go custom.



looks great
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      12-07-2018, 11:36 AM   #12
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Quote:
Originally Posted by leeadam View Post
just go custom like mine...free flowing no flaps... and bigger than 440 3.5 inch tips
Hi mate,

Can I ask who did this conversion for you? I Have a 435d and am wanting to go full custom like you with required defuser to fit. I'm in the north east.

Cheers

Jack.
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      12-07-2018, 11:37 AM   #13
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Quote:
Originally Posted by Darth Helmut View Post
Agree with Lee. Just go custom.



Hi mate

Same question to you..
Can I ask who did this conversion for you? I Have a 435d and am wanting to go full custom like you with required defuser to fit. I'm in the north east.*

Cheers

Jack.
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      05-10-2019, 12:30 AM   #14
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What does it sound like with the back box delete please? I bought a 435i back box but I'm thinking and agreeing what you've done seems a better option :-)

Thanks
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