I have Willwood calipers and drilled and grooved disks on the front of my J15.
The brakes passed IVA and work great but I've noticed a strange noise when I brake.
Do drilled and grooved disks make any noise?

What kinda noise are you getting? Squeal? Whiring?
Have they been beded in? (Presume new pads and disc with recent IVa?!)

Does it sound like a woodpecker? If so mine do exactly the same.

[Edited on 20/5/18 by Dave Bailey]

Drilled and grooved discs make a horrible noise! Sounds like a rough grinding

A whiring noise probably best describes it.
Only done around 250 miles since IVA and disks and pads were new.
Doesnt sound good but at least it seems theres nothing wrong.
Thanks for the replies.

Sounds normal, bed them in, should be fine! Get them
Stinking hot then cool slowly, bleed the fluid through once cooled. 👍🏼