i dont have any experience with VWAG stroker builds so dont think of me as an expert. all i can give you is my opinion.
a lot of people that stroke out their engine are looking to achieve as much power as possible from their current powerplant. a normal 1.8t with good cylinder walls can simply get rods and bearings, and stock or lower compression pistons, and run all day with a bt/bat. the stroked 2.0t will carry a fair amount more torque below the curve (before the turbo achieves adequate boost levels), as well as having a tolerable rod ratio to still run high rpms (with a built head). stroking the 1.8t seems to be a win win situation all around. the only issues arise are money, and down time.
it is not recommended to build your engine on your daily driver, unless you have a spare engine you can have sent out for machine work, and build until you are ready for install. there is a significant amount more work that goes into stroking the engine rather than just throwing in rods. (r&i engine, bore, hone, r&r crank and associated bearings, blueprinting block, magnaflux, balancing, etc). you just cant expect it to all be done in a weekend or anything. also the associated cost can be nauseating between the forged components, machine work, head rebuild (optional), and all the labor costs can quickly become astronomical. a lot of the guys that get the intensive engine work done because they can save around half the cost by doing themselves, which is not something (no offense) a typical accountant can do.
what it really boils down to is "what do you want the car to do?"
are your goals a fast daily driver? a track-star? an a4 that eats vettes and shits lambos? anything is possible but how fast do you want to spend? also, i really hope you arent considering going to a 2.0 build on a chipped k03 as the minimal gains will be eclipsed by the cost of the build.
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