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Message: <blockquote data-quote="Marky Dissod" data-source="post: 27583" data-attributes="member: 13218">If the exhaust system improves SCAVENGING('back pressure'? In 2026, people still say 'back pressure'?)improves SCAVENGING at or under 3000RpM - if it improves part-throttle Volumetric Efficiency - then yes, a tune based off of realtime driving data would be advised.Long story short, if MpGs get worse, then you'd better get a tune where you send driving info back to the tuner (avoid mere mail order or canned/plug-in tunes),so that the tune can be refined specifically to recoup those MpGs.If the exhaust system improves MpG all by itself, congrats.</blockquote>