Something very custom is being done today on my car and should be all complete by tonight! Until then, this is the teaser thread!
Edit: It's related to the R18 engine.
Edit #2: Bad news, we're missing a part and it's going to take at least two weeks to be manufactured. Since I can't keep you guys teased like this for such a long time, rw_blaze's guess was bang on. I'm having a custom intake being made for me by PRM Racing.
Sound clip:
http://www.prmracing.com/files/WS_30180_edit.wma
WIP pictures will be up soon. Sorry guys.