Is there any way?

blackshuck

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To tell if my S3 has been remapped without a RR!
Had some fun today with another and just showed him my shiny new led tail lights!.....lol

Ta
 
Well a normal standard S3 will boost to around 12psi and mapped will be higher, mine boost up to 21psi at about 3,600 revs. Also MAF will read around 200g/s on a mapped car.
 
You need someone with VCDS / vagcom that can check. You can do it yourself if you get a cable from eBay and download the free VCDS from Ross-tech.