Almost certain marlins bypass box is about £380 plus vat and hondata is £735 all in delivered but bear in mind that hondata gives you mapped on a standard engine 40hp more as per cpl site obviously you have to take this with some salt.
What the hondata controls is superb simple things like when the engine fan comes on makes such a diff and of course vtec control which ius set as standard at 5800k but mine is now set at 4000k after advice will see when its driven properly.
Also mine is getting charged so hondata needed
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