Since you have 2.5 go with the same size. Even with my 3" dp, I would go down to 2.5 and keep it 2.5 through out. This likely will give you the best of balanced torque and power. My decat GTI smells and I probably will go down this route in the future. Mine is revo stage 2 and with decat and sensor in place, no problem with CEL as I believe it's deleted from sensor point of view.
06 Polo GTI - REVO Stage 2 = 140kw @ wheels.
06 Golf GTI - Bluefin Stage 1 blacked out with ED30 theme, leather, xenon, etc.
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