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RB25DET Whistling Hey all. I've recently had an a new issue with the RB25det in my Series 1 C34 Stagea. Last week I changed the plugs and coils, which solved the misfire problems I was having. After getting everything back together I'm now getting what I can only describe as a 'kettle whistle' it's noticable from 70km/h and quite loud at 100km/h ( a speed in which the car drives at a lot), and I do get slight hints of it at around 60km/h. Tonight after double checking the plugs it did feel like it wasn't boosting as much as it normally did. I put in Irridium sparkplugs, and Splitefire coils. Have doubled checked all connections and everything appears to have a good connection, and couldn't spot any lines with fatigued lines. Wanting to know if you guys could suggest anything to check. Mods to car; 3inch split pipe dump 3 inch ehaust, but retaining the stock 2inch cat GFB plumb back BOV K&N Pod filter Return flow front mount intercooler Turbo smart bleed valve set to boost the car to about 9-10psi All these mods have been on the car for at least 3 weeks before the whistling started, and was planning to remove the bleed valve, and put the factory diverter valve back on tomorrow morning before I need the car for work.