Yes. I'm using J's test pipe.
When I used stock ECU, No CEL came on with J's test pipe.

And, the CEL code is different I think.

I already got an anti fouler plug (around 8cm) thing.

Thanks!!!

Can you read the CEL code and let us know what it is please ?

P0411 Secondary Air Injection System Incorrect Flow

Did you get that CEL AB ?

How did you tackle it ?

No I didn't as I still have the functioning air pump. Most people remove it for weight saving, but I kept it for passing the UK MOT regulations.

It's so amazing.
The scanner from Honda dealer couldn't reset the P0411 code with J's ECU, but resetted by pulling out 7.5 backup fuse.
Anyways, It came on again in the morning.

Seems to me that the J's is throwing a code because your air pump has been removed. Did you request that the air pump circuit be removed from the ECU?

By the way, today I fitted my J's Racing Test Pipe! What a sound!!! So far no CEL, but I did only 50kms today. Still early. ;)

The code also came on with air pump.
I requested to disable the air pump to J's racing and paid extra money for cutting air pump.

Now, I removed air pump & relay.
And there is 2.5cm air horse from under intake manifold to air pump and the other 2.5cm air horse from air pump to Intake pipe.
After removed the air pump, I connected those two air horses together. So the 2.5cm air horse from under intake manifold to Intake pipe directly.

And there were 2 coupler from Relay & 1 coupler from air pump. They've been disconnected since I removed the air pump & relay.

I haven't yet touched Air control valve & solenoid valve & vacuum stuff & fuses, related to secondary air injection system.

I asked this situation J's racing and he said "replace every fusebox and relay for secoundry air injection system".

If the air pump circuit is removed from the ECU, the CEL should not be ON.

Tomorrow, I wll try to remove air control valve & sloenoid valve & vacuum horse.

Good luck. :)

There is a thread in Uder the Hood which talks about removing the air pump and the necessary steps to make it work correctly. I will try to find it for you.