*Audi/Volkswagen 2.0T (All models)
Many engine software upgrade options are available and produce on average 35 to 56 peak hp with torque gains of 80 to 100 lb-ft. Some operate as stand alone upgrades while others offer hand-held tuning devices to switch from stock to modified at the push of a button. Some companies allow the user to select multi-octane programs for increased performance when using higher octane gasoline. Sources include APR, GIAC, Neuspeed and Revo Technik. $499-599
APR also carries a K04 turbo upgrade for both the transverse and longitudinally mounted 2.0T engine. The kit maintains an OEM look by utilizing a 3K Borg Warner integrated turbo and manifold assembly. The kit also includes the necessary gaskets and fuel management parameters to ensure everything works the way it should. Coupled with a turbo-back exhaust, the kit should produce a claimed 300 hp and 323 lb-ft of torque. $4,299
*Audi A3 2.0T
A major hurdle when trying to make power on the 2.0T FSI is overcoming its restrictive stock downpipe and dual catalytic converters. The trick when replacing the downpipe is increasing its size while maintaining proper backpressure, and running a catalytic converter that will not throw a check engine light. Check out Neuspeed and Milltek (imported by Stratmosphere). $799-$1,199
When boost is increased on any turbocharged engine, additional heat is also generated. A larger intercooler to keep temperatures in check is a must. Eurojet Racing has developed a front-mount intercooler using a 29x9x3-inch core to do the job. $929
Alternatively, Germany's legendary Oettinger (distributed by CEC) has released a 280-hp power kit for the 2.0T engine, which consists of a larger turbocharger and matching engine management. The upgrade yields claimed peak torque of 294 lb-ft, clocking a claimed zero-to-60 time of 6.1 seconds and a top speed of 162 mph. $6,642 (est.)
For the true power junkie, Oettinger also offers a 310-hp version. This comprises a turbocharger and integrated manifold, turbo-back exhaust with high-flow cat, modified intake system, and ECU recalibration. Final numbers: 310 hp at 5800 rpm and 316 lb-ft of torque at 2700 rpm, zero to 60 mph in 5.9 seconds and a top speed of 165 mph, according to the manufacturer. $12,646 (est.)
*Audi A4 2.0T (B7)
Milltek offers a direct fit 200-cell HJS metallic catalytic converter. This upgrade allows for a reduction of exhaust gas temperatures, giving more consistent power under aggressive driving conditions without setting off a check engine light. Imported by Stratmosphere. $899
One upgrade which has proved popular is Neuspeed's full 70mm cat-back exhaust for Quattro-equipped 2.0T models. Manufactured using aerospace T304 stainless steel and low restriction mufflers, the claimed gain is around 15 hp. $1,399
*Volkswagen Jetta/GTI (MkV), Passat 2.0T (B6)
ABD Racing addresses the heat-soak issue with its front-mount intercooler kit. Featuring a large core and mandrel bent tubing, it is engineered to prevent power losses due to high temperatures. $1,195
The next logical upgrade for any turbocharged engine is a turbo-back exhaust system. With the 2.0T, this mod is a must, especially when chasing power greater than 260 hp. Exhaust sources include APR, Neuspeed, Milltek (distributed by Stratmosphere), and Techtonics Tuning. $1,095-$2,099
*Volkswagen Jetta, Golf 2.0L 8v (1996-2005)
Developed especially for your unloved VW 2.0-liter four, Neuspeed has engineered an Eaton-based supercharger system that will give up to a claimed 50-percent increase in power and up to 55 percent more torque. This is a great way to get extra power without having to buy an new vehicle. $2,499
Another option on 2.0-liter VWs is to swap the engine with a 1.8T from a late-model (2000-2005) Golf or Jetta. Getting the engine is the easy part, but adapting the electronics is a completely separate issue. Eurospec Sport has developed a complete line of parts to help with the conversion. Contact the manufacturer for pricing.