Lower intake boot for sure. Mine cracked on the small flexible house and you described it exactly how I did. I should be getting mine in today and I will post results.
Lower intake boot for sure. Mine cracked on the small flexible house and you described it exactly how I did. I should be getting mine in today and I will post results.
I dont think it is the lower intake boot at all. I installed a K&N replacement air filter into my OEM air box, and immediately after I experience the same whistle. You should check and see if the previous owner (or maybe you) installed a different than OEM filter. I think the aftermarket filters just whistle a bit. Only reason I don't think it is the intake boot, is the milage of the car...fairly low for those kind of issues it seems?
Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim
Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim
-- Confirmed. Sound is gone, no CEL.
I just had this "whistle" develop in my E30 yesterday, I'll check the lower intake boot today after work.
2003 Mystic Blue 330i ZHP 6 MT
born in germany | delivered to baltimore | spent time in texas | resides in utah
aFe ProDry S Air Filter | Dinan Stage 1 Software | H&R 27mm Front Sway Bar
Bridgestone RE760 | StopTech Street Performance Pads
BMW OEM Clear Corners & Side Markers | Ziza LED Light Kit | AL Bi-Xenon Retrofit | BSW Soundplicity iPod Integration
I have the same sound. I thought it was actually part of my drive-by-wire throttle lol. All this dag gumb newfangled tek-naw-low-gee!
Turns out I found a small, paperclip-sized crack in my lower boot. I'll go ahead and replace it to see if that solves it.
Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim