Idle speed is dead on perfect as per spec. It is dumping A LOT of fuel though, so it's reading a ton of air from somewhere. When I had my volant, I watched the fuel trims for a few days, and they were no where near that high. Some members that have been using the powercore filter have been having issues with too much air. If you're running that, try getting an Amsoil or AEM dryy filter, both seem to have remedied their issues. I wouldnt think that you have an air leak anywhere, because the idle would definitely be higher than that. You can get a can of brake cleaner and go around all parts of the intake and listen for it to bog down( truck running). There are a few inherent issues with the volant intakes on some of them. The tube can have pin holes down the side seams, the MAF sensor mount often doesnt seal nicely or can alos leak around the brass bungs.
I also just checked my fuel trims the other day with my Nismo intake on and at idle they were at B1: 101 and B2: 102. Which is basically flat and perfect. If you have the ability to look at long term and short term trims, post the numbers up. Long term trim should be around +/- 5% and short terms around +/- 10%.
