I recently noticed that I have 2piston calibers insted of single piston I was expecting to have.
I have a 98' convertible JDM imported so is there any difference from the JDM celicas to the EUDM/USDM ones or all the latest 6g celicas have 2piston calipers?

Did the previous owner swap in the st165 calipers? Because I'm sure the US celica owners all have single piston calipers.

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I don't think so... the car came to cyprus from japan 100% stock so i don't think that someone who likes the car stock goes throu the trouble to change just the calipers. The 1st owner in cyprus was my uncle (who only chamge the wheels to some 18")and I was the second, so...

I wonder how much surface area the dual pistons you have take up compared to the st165 dual pistons.

After some searching on the web found dome info from an other forum

http://www.toymods.net/forums/showthread.php?p=106070

...so there are some st202 out there with twin piston calipers from factory and I have one of them