Yep,you are right... i'm going the noob way..., and in fact i'm so bad at english that it's hard for me to explain all those things. i'm not a mechanics, i work for me with no help so i do what i can. it starts with my brothers polo... i take it to go shopping, and i fall in love... 1 week later a bought a tdi lupo with a 1.9 tdi conversion in mind...for fun the fact is in france, swaps are not possible. french mot... insurances... so i decided to boost the 1.4 and so i start reading all i can find on the subject. after many research i find that i can put a vnt turbo etc... but also that the gearbox will die quick. so after many readings on vw gearbox... pretty simple subject... i read nils6L post on his arosa... and try to copy his setup, but i don't really want to open my gearbox rebuild it, and broke it because it's a weak gearbox and i want torque after discussions with a french friend who own a 175bhp Ibiza 1.4tdi, i conclude that pd100 ggu gearbox will fit with another flywheel and clutch.... i came here to get answers on the compatibility... as i can't have any , i go my way in fact i found an ibiza GGU gearbox 30k miles approx, for 200£... so i bought it anyway i'll order that soon also http://www.darksidedevelopments.co.uk/products/darkside-silent-g60-single-mass-flywheel-clutch-kit-for-5-speed-02j-02a-02r.html i have a gt1749va out of a passat 130 modified to fit the amf manifold a 320d intercooler now a GGU gearbox so a 02R and some G60 callipers and a rear disc beam from a polo 6n tdi and... i must find a 23,8 mm master cylinder... i need also to remap, but i find someone who can do it and test it on the roller to... so i need advices... Thanks