ok u got the chiped p28 thats good put u need to a tuning shop to have ur engin tuned cause every ls vtec engin is different ,no u dont need a knock sincer but u need to get it tuned right also did u block the vtec oil retarne an the dowlpins an oil line

ok my lsvtec is a 98 type r head an skunk2 valve springs an retaners an im runing a chiped p28 ecu thats tuned my car runs high 12s all motor