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I believe today I fixed the miss fire on my XKR, I posted what I did in total on my miss fire help thread. I had bought a pair of CATS, if you don't want to spend thousands of pound try these I have: https://www.ebay.co.uk/str/ahgdiesel fit perfect from Germany. I also fitted brand new oxygen and lamda sensors and studs and nuts where possible. Without the mid and rear exhaust sections as I removed the whole thing damn is she loud lol. Anyway next will be straight pipes from Paramount performance. I want the tips to be black with carbon surrounds so waiting on that to be priced. Anyone once that is orders I will have an XKR mid section and back box for Sale in good condition
Pulled some runs today in second gear , results are interesting ! these n/a v8 love fuel and love to rev . Finally saw 255g/s on this with the higher 7000rpm redline
Power is decent at standard redline but there's further gains to be had with more rpm
Dare I say it the biggest restrict now would have to be the headers
Last edited by steve_k_xk; Apr 5, 2026 at 08:25 PM.
I'm not sure how the n/a 5l would go with the extra revs I think standard redline is like 6500 on them although you have vvt on the inlet / exhaust plus variable lift on inlet so it's packed with goodies also a variable inlet manifold so your power is pretty good especially after a simple tune , cats and x-pipe unlike the n/a 4.0/4.2/4.4 which are quite lazy and need the extra revs to make power
Last edited by steve_k_xk; Apr 6, 2026 at 04:34 PM.
I polished my lens after 2000 grit sanding. They have held up for 2 years, starting to yellow a tad.
wj
That's pretty good actually
Mine were done about 7yrs ago and I just noticed it starting to flake and 2k is great it won't dull off or yellow it's quite resistant to the elements as well