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It will be 100% fine mine been Mapped years and run either makes f**k all difference to way it drives imo on na cars runs fine on either maybe slightly better on v power but not massive difference . Lot of placebo effect to the 98 Ron imo . Only becomes more noticeable on turbo cars .
http://www.totalcontrolracing.com/
Place has a unit on here majenta motors they done paint work for a few mates only in wednesbury so not far from you ;)