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A quote from when the Mk5 was first introduced : -
"While the Mk4 looked dull, the Mk5 GTi looks smart. While the Mk4 looked undistinguishable from the regular Golf, the Mk5 GTi looks noticeably different. Its big radiator grille - the first appearance of the new Volkswagen corporate grille - is blackened and decorated with red lining to deliver a more aggressive appearance. The big intakes at either side of the front bumper amplifies that sporty feel, though they are pseudo, actually a black plastic decoration. A 15 mm lower ride height is detectable by eyes. The deeper lip spoiler, side skirts and additional tailgate spoiler are even more apparent. But most important of all, no other Golfs ride on 17-inch alloy wheels with 225-width tires. Neither do they have twin exhaust pipes. See through the wheels, you will discover eye-catching red calipers clamping larger brake discs. From the appearance, the new GTi is already promising."
It goes on and on but you get the story?