Strange question but how could I tell that my Subaru is a 2.1 stroker 

would it be just a case of whipping the sump off and seeing what’s in side 

or would the heads have to come off also 

I’ve got receipts and pics of the work but I want solid proof if you know what I mean 

You could try looking for signs the block halves have been split ( marks on the block bolts , fresh sealant poking between the block halves ect )

Or if your receipts list forged pistons use a endoscope to look at the piston crowns, to see if they are the ones the receipts say are fitted.

 

The only real way to be sure its a 2.1 stroker is to take the sump off to see if it's got a 2.5 ltr crank and check what rods are fitted  .Along with knowing what pistons are fitted by either using a endoscope or whipping the heads off .

As a 2.1 stroker is basically a 2ltr with a 2.5 ltr crank and 2mm ish shorter rods or pistons . Crank increases the lenght of the "stroke", shorter rods or pistons stop the piston crowns poking outta the deck face too far 😉

Thanks mate just wanna make sure before tossing money at it 

Mine's got a 2.1 stroker..it's a more torquey motor than the 2.0 with more urgency..great bit of kit!