Engine

- What chips are available? What boost levels do they provide? Where can I find them?
* ABT/AMS 0.8 bar/1.0 bar
* MTM 1.0 bar (Stratmosphere, Hoppen Motorsport)
* APR 1.0 bar
* GIAC 1.0 bar (AWE, PES)
* Neuspeed 0.8 bar
* Greedspeed 1.0 bar/1.1 bar
* Wetterauer 0.8 bar/1.0 bar
* AutoThority 0.8 bar/1.0 bar
* Oettinger 1.0 bar

- What turbo upgrades are available? How much HP do they claim? Where can I find them?
* KO3 Sport turbo [TAP]
* KO4 upgrade kit [MTM (Hoppen) claimed 240HP, Greedspeed claimed 225HP, AWE claimed 235HP, PES claimed 235HP, Wetterauer claimed 235HP]
* GT25 upgrade kit [APR Stage 3 claimed 280HP]

- What aftermarket intake options do I have? Where can I find them?
* Turbo5 cone intake
* Lltek cone intake
* K&N insert
* Evolution Motorsports cone intake
* TAP cone intake
* HKS Megaflow cone intake

- Can I add a front mount intercooler to my A4? What's available? From where?
Yes, a FMIC can be added. Some modification to the stock front bumper may be required, however, to make it fit. An aftermarket front bumper with more space will make the fit easier.
* APR
* GreedSpeed
* Spearco
* TAP Sport Intercooler (slightly larger IC that fits in stock location)

- What kind of synthetic oil should I use? What grade?
The usual recommended brands in AudiWorld forums are Royal Purple, Redline, and Mobil 1. In the newer A4 manuals, 0W-30 is recommended, with 5W-30 as a substitute if the first can't be found. Depending on the weather conditions in your area, 0W-30, 5W-30, and 10W-30 are all acceptable.

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