I have the Jardines and the triple K&Ns as well, and was just curious if you can hear a ticking noise coming from the exhaust manifold. I have heard others say that they also hear this.
No, it's just a ticking at idle. Presumably it's lifter noise. My first guess would be that the Jardine headers are of a thinner material than the stock ones, or that the sound transmits because it's a different material. But others on this list have mentioned the noise too. There were no torque specs with the Jardines, and I did tighten them down a couple of turns more that I would otherwise.