Exhausts and Engine » Black Widow exhaust headers

Hi
I have looked and cannot see this topic previously addressed. I recently re-read a 2019 major UK bike magazine. It suggests that by fitting a replacement exhaust header set without a de-catalyser you can noticeably improve the mid-range. You can keep the existing end-can.

It is only £289 for the new headers. Has anyone else made this sort of modification and be able to share their experience?

This is the link to their site:
https://www.blackwidowexhausts.co.uk/bmw...018-23790-p.asp

Thanks

Yes you can keep the can with decat headers.

It is covered somewhere in the forum but I'll be fucked if I can find it.

I've not tried the Black Widow headers but have de-cat Akra's on mine and both the standard can and the SC comp one fits these.

Thanks for the reply. Is there any noticeable gain in mid -range performance if you de-cat the headers but keep the stock silencer?

I've got Remus headers on mine. Tried it with the stock silencer but thought what's the point putting the weight back on!

Zitat von Cole_K im Beitrag #4

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Thanks for the reply. Is there any noticeable gain in mid -range performance if you de-cat the headers but keep the stock silencer?

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I have the Akra Titanium headers. They look cool. They are louder, especially with aftermarket can. Performance increase? Not that I have noticed.

Hi Akro decat headers fitted and in my opinion the pick up in the mid range is better, originally run with SC silencer but too lean, a step too far. Keep in mind the bike is run very lean to get through regs and following decat it was marginal but still ran well I use 98 each fill-up to help prevent any detonation.

The exhaust valve fix is just to disconnect the actuation cables and fill the hole left in the motor housing or you can buy a pug in gizmo and totally remove motor.
Treetop map to correct mixture is strongly advised the midrange is now superb and response has to be felt to be believed. I will give SC a second chance now remapped see my post Treetop for a more detailed explanation.

Modding all part of the ownership fun.

Ady

Running Akro headers ans SC can (with baffle fitted) and Treetop on mine without any issues.

Zitat von Fugly im Beitrag #9

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Running Akro headers ans SC can (with baffle fitted) and Treetop on mine without any issues.

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Zitat von Bravo im Beitrag #10

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[quote] Hilltop...... Knobber

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A bit of advice from those who've fitted de-cat headers would be appreciated - do you re-fit the post cat lambda sensor, and does it throw a engine management light? Is there a lambda eliminator plug / product available? Cheers.

Zitat von Steviejuk im Beitrag #12

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A bit of advice from those who've fitted de-cat headers would be appreciated - do you re-fit the post cat lambda sensor, and does it throw a engine management light? Is there a lambda eliminator plug / product available? Cheers.

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An update - on a 1250 you get an emissions error message if you install headers with no cat after its fully heated up. It doesnt affect engine running, just the usual go to your dealer stuff. We've found a local - ish tuning outfit who reckon they can remap latest BMW ECUs - we'll find out when trading restarts

Zitat von Steviejuk im Beitrag #14

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An update - on a 1250 you get an emissions error message if you install headers with no cat after its fully heated up. It doesnt affect engine running, just the usual go to your dealer stuff. We've found a local - ish tuning outfit who reckon they can remap latest BMW ECUs - we'll find out when trading restarts

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