tnx sa mga replies dudes! finally had my resonator replaced by Nodalo's Alabang. though mejo mahal sa kanila by a few hundred bucks, ok na rin kse when i called CPM ulit nagkamali pala ng price quote sakin. mas malaki un ipinalit nila sa stock resonator (13 years in service). very much satisfied with the job. bumalik na ulit un dating humming sound lang (except for the occasional noise made by my valve tappets that needs cleaning/adjustment) my baby runs and sounds like new again. =)