^ahhhhhh. NO.
Its not the weight addition that you have to worry about, its the additional torque. Thats why when swapping a VR into a 2 liter body, you should swap axles as well (4-lug to 5-lug)
As far as modding, my Jetta has H&R coils, Chip, Hella Dual rounds, FK badgeless 2-bar grille, Euro Rad support, GTI hood conversion, votex long fogs, smoked corners and blinkers, GT tails, Euro-plate tub, LSD, lightened flywheel, Euro lip, Euro light switch, magnaflow exhaust...eh, thats all I can think of. 172,XXX miles and going strong.
But yeah, vwvortex is your best resource for parts as well as info.
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Since we were being extreme for so long I got really hungry so we went to Mcdonalds and got some chicken mcnuggets. -Skimack