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Anyone reworked 35i exhaust to sound like 35iS

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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Zikim
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Anyone reworked 35i exhaust to sound like 35iS

Post by Zikim » Fri May 26, 2017 7:29 am

Has anyone converted their 35i exhaust to sound like a 35iS exhaust. I believe the only difference is the extra sound deadening in the back boxes, so if you cut them open and remove some of the stuffing do you get 35iS sound (extra 10dB's) ??

Maniac
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Anyone reworked 35i exhaust to sound like 35iS

Post by Maniac » Fri May 26, 2017 8:03 pm

No idea... but i was lucky enough to need a new exhaust under warranty and they fitted a 35iS exhaust. I wasn't going to moan.. pretty loud.

Zikim
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Anyone reworked 35i exhaust to sound like 35iS

Post by Zikim » Sat May 27, 2017 1:08 pm

Maniac wrote: Fri May 26, 2017 8:03 pm No idea... but i was lucky enough to need a new exhaust under warranty and they fitted a 35iS exhaust. I wasn't going to moan.. pretty loud.
You lucky thing :thumbsup: What was the problem with the old one?

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Anyone reworked 35i exhaust to sound like 35iS

Post by Maniac » Sat May 27, 2017 8:02 pm

The emissions flap in the exhaust packed up.

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stuartinzg
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Anyone reworked 35i exhaust to sound like 35iS

Post by stuartinzg » Sun May 28, 2017 11:24 am

Maniac wrote: Sat May 27, 2017 8:02 pm The emissions flap in the exhaust packed up.
I don't think it's an emissions flap is it? Since once the engine has produced the emissions, it won't make any difference what the exhaust backbox does. It's my understanding it's for less drone/quiet startup. That's why before I changed my exhaust, I disconnected it :thumbsup:
35iS, Black/Coral Red, 19" BBS CH-R/MPSS, Eiback Pro Springs, CoolCarbon Performance Pads, Golf T, Stubby, LED 80w halo's, X6 tips, CarPro CQuartz, Custom painted accessories

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Maniac
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Anyone reworked 35i exhaust to sound like 35iS

Post by Maniac » Sun May 28, 2017 9:19 pm

Noise emissions is the main reason it's there.

Busterboo
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Anyone reworked 35i exhaust to sound like 35iS

Post by Busterboo » Sun May 28, 2017 9:24 pm

Maniac wrote: Fri May 26, 2017 8:03 pm No idea... but i was lucky enough to need a new exhaust under warranty and they fitted a 35iS exhaust. I wasn't going to moan.. pretty loud.
Yep, there are times when the 35iS exhaust could do with being switchable.
Vidi, vici, veni

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Wrs
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Anyone reworked 35i exhaust to sound like 35iS

Post by Wrs » Sun May 28, 2017 10:15 pm

I want to know what exhaust is fitted to this 35is..

Those tips :wub:
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Gone - Black Sapphire Z4 E89 35is
Gone - Midnight Blue Z4 E85 3.0si

Maniac
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Anyone reworked 35i exhaust to sound like 35iS

Post by Maniac » Sun May 28, 2017 10:19 pm

Could be anything without any markings.

sammyz
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Anyone reworked 35i exhaust to sound like 35iS

Post by sammyz » Tue May 30, 2017 6:18 am

The way the exhaust is configured it seems wrapping the internal pipes produces more noise by preventing exhaust gases escaping into the chamber's sound deadening materials. The e92 M3 exhaust mod leaves the material in place and wraps each bend in the pipes to produce progressively more noise. So you can have a 'one pipe' wrap for more noise but not too loud, up to a 'fourpipe' for all hell to break loose. :evil:

The only issue I would be worried about is the 35I being a turbo engine and messing about with back pressures. No idea if this might compromise performance or even damage the engine long term.
Yas Marina Blue 35i.

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Zed Five
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Anyone reworked 35i exhaust to sound like 35iS

Post by Zed Five » Tue May 30, 2017 9:35 pm

Maniac wrote: Sun May 28, 2017 10:19 pm Could be anything without any markings.
im pretty certain it's chav. :poke:
Why is it that people who can't take advice always insist on giving it? 

E89 35is | BMW S1000rr Motorsport Ed.

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