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Just did the same mods a couple of days ago. Forge DV's and aFe intake. I also used the yellow springs and didn't notice a change in sound when lifting off. I am running 14.5psi. I am auto so that might make a difference or the valves with the yellow springs don't let out as much air.
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08 E90 335i AT RB Turbos -NX Wet Kit - Chiplogic Flash or Procede V5- M3 Diff - AE Exhaust- Forge Dv's - Helix Intercooler - AR DP's - P3 Boost Gauge - Vishnu Meth- Stett Chargepipe and CAI
09 C63
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