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Brian's Application Notes: Not needed for those getting our Longtube header that has a massive resonator in the midpipe. That midpipe large resonator hangs down a bit under the car, will not be everyone's cup of tea. Thus, for those getting our standard length header, or already using standard length header from another company with our standard length midpipe, this is the cure for raspy sounds unleashed by that standard length performance header. If confused by your choices, give us a call or drop us an email to discuss.