UK Noise Limits With An Akra Full System

[CJC]

Hi,

I'm considering upgrading my K67 to a full Akra (stainless headers, titanium can) system, but am concerned that the increased noise levels may mean that the bike doesn't pass noise testing in the UK.

Regardless of what the vendors of these systems say, I was wondering whether the forum members have any practical experience on this for "normal" UK trackdays?

1) If you have one of these systems, does your bike typically pass noise testing without a baffle, or does it need a baffle in to get through?
2) If you use a baffle, how much does this restrict performance? Do you still get more than with a stock exhaust?

Thanks in advance for any help you can provide....

CJC

 

[alex]

Static, passes with and sometimes without a baffle.
Ride By, fails without a baffle...and sometimes with.

 

[TheGodfather]

If it's a 102 day I never had a problem with baffle in.
96 days had to be a bit careful with the throttle on noise test.

 

[mattals]

I have Full Akra system titainum been fitted since new. It has never failed noise test nor ride by and never fitted a baffle.

Goes through noise test without baffle its never failed even at Brands.

 

[alex]

Man, I got done at Snetterton for driveby upshifts...so unfair.

 

[mike g]

mines on a gen1 no problems not needed baffle

 

[Mellorp23]

Do you actually need an aftermarket pipe to better your track day lap time, or will it just make more noise ?
Different tracks apply different rules. Most liberal to most strict Anglesey, Cadwell, Donington (loud day), Croft, Oulton, Mallory, Bedford. No idea about Knockhill, Brands or Snetterton. Castle Combe say on their web site which std. pipes will fail

 

[alex]

Need, no. Like the noise and weight loss, yes.

 

[lightning_bob]

Be aware that in the uk they are looking to implement noise cameras, they pick up anti social exhaust noise and send you a ticket through the post

 

[mattals]

Do you actually need an aftermarket pipe to better your track day lap time, or will it just make more noise ?
Different tracks apply different rules. Most liberal to most strict Anglesey, Cadwell, Donington (loud day), Croft, Oulton, Mallory, Bedford. No idea about Knockhill, Brands or Snetterton. Castle Combe say on their web site which std. pipes will fail

Recently did two days on the bounce at Cadwell and they barely even did a noise test, Pulled up rev to 5.5 he went passed Lol. 3 of us on Gen 4s none of us run baffle's all with Akra Systems. I find Snet tame too. Always found Brands the most strict on drive by, but I've never been stopped

 

[lightning_bob]

Depends how residential the area is around the track, goodwood are quite strict

 

[Mellorp23]

Need, no. Like the noise and weight loss, yes.

I don't know how much that exhaust system would cost but I'd rather pay for some personal tuition and go faster.
Loud + not on lap record pace = not very good (buy a CB500 instead)
Fast + quiet = excellent
IMO of course

 

[DNCN]

Fail Brands (92) and Donington (98) drive by limits without a baffle.

K67, arrow stainless headers, Akra ti can.

Can’t be arsed with the messing about anymore. Baffle stays in.

 

[CJC]

Fail Brands (92) and Donington (98) drive by limits without a baffle.

K67, arrow stainless headers, Akra ti can.

Can’t be arsed with the messing about anymore. Baffle stays in.

How noticeable is any performance drop from adding the baffle?

 

[CJC]

I don't know how much that exhaust system would cost but I'd rather pay for some personal tuition and go faster.
Loud + not on lap record pace = not very good (buy a CB500 instead)
Fast + quiet = excellent
IMO of course

Yes, agree your point about tuition (and my strategy for a long time too).

This is the first time I’ve even considered any form of aftermarket exhaust. I reckon that losing 5kgs off the bike (and some off me) will make it even easier to pass those red wheelbarrows which have sprung up. Sometimes they wobble through the corners and rely on bike performance up the straights.

 

[DNCN]

How noticeable is any performance drop from adding the baffle?

Maybe engine braking effect is a little more noticeable. But overall no noticeable difference to me, you might be able to pick it up on a Dyno.

Bike is mapped so its way better than stock anyway.

 

[Wull]

There isn’t any testing at Knockhill, their website says there is a limit but there isn’t.

 

[fast_ryan]

I had a Akrapovic full system fitted on my previous K67 and now on my K66. For UK trackdays just leave the baffle in and forget about it. You have nearly 200 bhp available and you won’t notice any real difference unless your a BSB racer.

 

[Ajj]

I had Arrow Ti race pro system, 65mm, and never got a ticket for noise. But it is questionable if those cameras on the A272 work.
Using the dB killer did reduce the noise a lot, unlike the F900 with full Arrow system.
From what I have seen with various bikes and dyno runs, don't be surprised at 15hp loss and sometimes more.

 

[Ajj]

@CJC I wouldn't pay that much for the Akra system. I think @DNCN has some pipes for sale. Copy of the Akra.