ZZP Ecotec 2.5" Stainless Resonator $119.99 Default Title Add to Cart Please fill in the form below if you'd like to be notified when it becomes available. Your Email Send This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. This is ZZPs replacement to our old Whisper resonator, it is very quiet.Our 2.5" version measures 28" end to end, with a 24" x 5.25" body.