Hopefully someone can help.
So I just bought a 06 Mazda 6 and I was told when I bought it that the guy put a 2010 Mazda 3 motor in it. The 06 Mazda 6 stock has a 2.3L and the 2010 Mazda 3 has a 2.5. Now for one Iím not 100% sure what motor is in it and I need to know. Thereís a 2.5 stamped on the block but not 100%. When I purchased the car the clutch was slipping(taking extremely long to get into each gear and severely lacking acceleration. Because the motor swap I am unsure which clutch kit to purchase. Any help would be so very greatly appreciated.

So the clutch finally went. Car is now down and I am unsure if I need to buy a clutch for the 06 mazda6 or the 2010 Mazda 3