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Message: <blockquote data-quote="esterix" data-source="post: 50680" data-attributes="member: 638">And I thought Kevster would be the first to suggest a fuel rail upgrade, with a fuel pressure gauge at the end!!!  :yes: Bundy - here is my experience with the O2 sensor. Modded engine to increase performance. Set to run slightly rich at top end to avoid meltdown. O2 sensor start getting plastered with carbon (due to un-burnt fuel) with too many top end runs. Sensor messes up readings and feeds wrong info to ECU. ECU compensates according to readings, resulting in inconsistent air fuel mixture. End result - hesitant engine. Remedy - clean O2 sensor (luckily did not have to replace). Keep mods but avoid too many top end runs, or go back to start!  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /> On a serious note and IMHO, if there is one mod that would give a meaningful upgrade in performance, and bang for the buck, it is an MAF kit. This will be measurable on the dyno.</blockquote>