Better yet - Just invested in a second hand mugen

The verdict - Linear improvement throughout the rev range!

Coming from a stock airbox assembly w/o the resonator I found the sound in VTEC to be (more vicious) that OEM however the induction noise down low more quiet.

All in all - pickup is excellent and my car now screams even more - Very impressed; well worth the money!

Only query is that of a slight whistling sounds at 25% - 50% throttle at low revs.

Why is this and is this normal????