- CNC mandrel bent 14 gauge aluminized steel tubing
- CNC machined 3/8" thick flange mates exactly to the stock
flange and gasket
- TIG welded construction
- 2.5" piping reduces to the stock 2.150" band clamp for a
- Fits exactly like the stock
cat. No cutting or custom fitment required
- Mk3 OBD1 & OBD2, Corrado G60 & SLC, B3& B4 Passat
- Oxygen sensor bung locations differ by version and allow
fitment of the oxygen sensor without ever modifying wire length!
- Pipe size reduction means the stock band clamp fits with no
hammering or sealant
- 2.5" through versions available in all fitments (no reduction
to stock band clamp)
- Includes grade 5 hardware and OEM gasket
- Installation instructions included
2.5" Through Test Pipes - Fitment Details
By popular request our test pipes are now available in 2.5" through. These
pipes fit exactly like the original but lack the reduction to stock band clamp
size. This allows for a straight-through fitment when using 2.5" exhaust. Our
2.5" through test pipes terminate at the center of the stock band clamp. Many
2.5" cat-back exhaust systems for the mk3 VR6 have a built in reduction to the
stock band clamp size. In this case, the cat-back exhaust system will need to be
modified. The reduction will need to be removed, a 2.5" section of pipe added
and a 2.5" band clamp added. Many cat-back exhaust systems begin at the center
of the stock band clamp as 2.5". In this case no modification is required. Due
to the variances in ca-tback designs we cannot provide a 100% bolt-on 2.5"
through test pipe for any or all aftermarket exhaust systems.
42 Test Pipe
||VW mk3 Jetta, Golf, GTI 1994-1995 VR6 & 2.0 |
||VW mk3 Jetta, Golf, GTI 1996-1999 VR6 & 2.0 |
||VW Corrado 1989-1995 SLC VR6|
|MK2 / B3 / B4 / G60
VW mk2 Jetta, Golf, GTI 1985-1992 8v & 16v
VW B3/B4 Passat up to 1997
VR6, 2.0 & 16v
VW Corrado 1989-1995 G60
Let's face it, removing the cat isn't going to be like a shot
of nitrous. However, we find this modification to be very worthwhile. Years ago
we did a back to back test and found peak gains of 5whp and 6wtq on a normally
modified all-motor VR6. Those numbers are certainly worthwhile in a detailed
all-motor build. Evan larger power gains can be had on supercharged or
turbocharged car. Of course, individual power gains depend on the condition of
the catalytic converter removed, the exhaust system used, and the condition of
the motor. We wouldn't build them if they didn't work.
The resulting sound of a test pipe also depends on the exhaust system used.
Overall, adding a test pipe increases the volume of the exhaust note while also
providing a much sharper sound. For example, when using a Magnaflow 2.25"
cat-back exhaust system the volume of the exhaust note increases some at idle
and cruising while becoming significantly louder at higher RPMs. Idle and
low-load cruising attract little additional attention to the vehicle. High-revs
and aggressive driving are obviously louder activities. Inside the car all low
rpm 'drone' disappears. The exhaust note can be heard, but does not drown out
the radio or conversation.
- Check local laws and emissions testing requirements before purchasing. In
many states it is illegal to remove emissions devices.
- May cause 'catalyst below efficiency' fault code and / or check engine light
(CEL) to illuminate in the instrument cluster
- For off road racing and testing purposes only!