SLE Test Pipe – B6 Audi A4 (1.8T)

The SLE Test Pipe is built to replace the restrictive factory catalytic converter on the B6 Audi A4 1.8T, unlocking additional performance and a more aggressive exhaust note. By removing the most restrictive part of the exhaust system, your turbocharged engine will spool faster, make more power, and respond more sharply, giving you a more engaging driving experience.

On tuned vehicles, expect gains of up to +15–20whp and +20–25wtq, along with quicker throttle response and reduced turbo lag. This upgrade transforms how your B6 A4 drives both on the street and at the track.

Constructed from 3" T304 stainless steel, the SLE Test Pipe is built for strength and long-term reliability. It features CNC-machined flanges for a perfect seal, two O2 sensor bungs for factory sensors or block-off plugs, and a reinforced mounting bracket for secure, OEM-style fitment.

Product Features

• Gains up to +15–20whp and +20–25wtq (on tuned vehicles)

• Faster turbo spool and improved throttle response

• Deeper, sportier exhaust tone

• 3" T304 stainless steel for durability and corrosion resistance

• CNC-machined flanges for precise fitment

• Integrated mounting bracket for stability

• Two O2 bungs for sensors or block-off plugs

Vehicle Fitment

• 2002–2005 Audi A4 (B6) 1.8T

Compatible with both manual and automatic transmissions.

Important Notes

• Fits 1.8T turbocharged engines only

• Will not fit CVT transmissions

• ECU tuning is highly recommended to prevent check engine lights and maximize performance

• For off-road use only