2003 Audi A4
Turbocharger

We do stock the KO4 from Borg Warner but it is not listed on our website. Please contact our sales department at 888-907-7225 for a quote.

We ship internationally via UPS Worldwide Expedited; shipping cost and ETA are calculated at checkout. Keep in mind that we can only guarantee fitment on left-hand drive, US-market vehicles. If your vehicle was privately imported from the US, we can double-check your VIN to be safe. If not, we can also look up any OEM part numbers off your original turbo to see if they match anything we have.

Yes, we have the correct turbo for a 1992-1997 Audi S4 & S6 2.2L available here:

https://www.buyautoparts.com/buynow/40-30666_BW

This is a brand new, genuine OEM BorgWarner turbo, exactly the same item you'd get from an Audi dealership.

The turbo and intercooler are two different parts, not a single assembly, but every vehicle that this turbo fits is also equipped with an intercooler, usually tucked right behind the bumper.

This turbo (40-30002 SG) is a stock replacement that's going to fit and function just like OEM. If you have a few other bolt-on mods, it shouldn't be an issue with this turbo, but we also have a K04 upgrade available here:

https://www.buyautoparts.com/buynow/40-30002_SH

The K04 has a slightly larger compressor housing that can flow more air and create more power, while still retaining a response close to the OEM K03; none of the lag traditionally associated with a big turbo. If you need to replace your turbo anyway, it's not a huge price increase, and it's much better suited for the higher dyno numbers you're trying to get.

This turbo (40-30002 SG) is a stock replacement that's going to fit and function just like OEM. If you have a few other bolt-on mods, it shouldn't be an issue with this turbo, but we also have a K04 upgrade available here:

https://www.buyautoparts.com/buynow/40-30002_SH

The K04 has a slightly larger compressor housing that can flow more air and create more power, while still retaining a response close to the OEM K03; none of the lag traditionally associated with a big turbo. If you need to replace your turbo anyway, it's not a huge price increase, and it's much better suited for the higher dyno numbers you're trying to get.

This turbo (SKU 40-30002) fits all US-spec 1997-2006 Audi A4 and VW Passat 1.8T

This turbo (40-30002) only fits 1997-2006 Audi A4 and VW Passat 1.8T; it does NOT fit any VW Golf, Jetta, New Beetle or Audi TT because of different mounting points. We have more information about stock K03 vs upgrade K04 available here:

https://m.buyautoparts.com/blog/2773-2/

Yes, this turbo (40-30002 BW) is a genuine OEM BorgWarner stock replacement, the exact same item you'd get from an Audi or VW dealer, and it's going to fit just like the stock turbo it's replacing.

This turbo (Stigan 847-1001, SKU 40-30002 SG) is a stock replacement that's going to fit and function just like OEM on all US-spec 1997-2006 Audi A4 1.8T or Volkswagen Passat 1.8T

No, this turbocharger (40-30002) is for a 1997-2006 Audi A4 1.8T or VW Passat 1.8T. Your SLK230 is supercharged, not turbocharged, but we have a replacement supercharger available here:

https://www.buyautoparts.com/buynow/40-10018

This turbo (Stigan 847-1435) does not include the gaskets, but we have it available with gaskets and an oil feed line (for better long-term reliability) here:

https://www.buyautoparts.com/buynow/40-80345_S5

No, this turbo (40-30002) is for 1996-2006 Audi A4 1.8T & 1998-2005 VW Passat 1.8T. What year is your Civic 1.5T? We can check to see if we have the correct turbo listed on the site.

Thank you for your inquiry. Yes. The AN, SG, R, and BW versions are all OEM replacements that comply with CA emissions. The high-performance upgrade versions, AW, HP, OH, and SH are not.

Thank you for your inquiry. Do you have a VIN. a 2001 VW 1.8L GTI was an Natural Aspirated when it was produced here in the USA. 

Thank you for your inquiry. Cannot ship to California or Colorado due to CARB restrictions.

Thank you for your inquiry. Yes, this fits 1996 - 2006 Audi A4 1.8L Engine