So I’m in the market of purchasing some test pipes and I’ve been noticing that there isn’t a way to prevent the cel light unless you get a tune?? Also if I’m due for emissions later on do I just swap back to the oem cats for a while and I’m ok?

 

non-fouler extensions, you'll need the deepest you can find to accommodate these o2 sensors.

 

Build an O2 simulator. Works like a charm!

 

If one set of non-foulers doesn't work take a SECOND set and drill the hole out bigger then screw them together. This moves the O2 sensor even further from the exhaust stream.

Some test pipes have a very long extension on them already to keep the O2 sensors back, the Motordyne ART pipes are a good example of this, so are the Fast Intentions resonated test pipes.

 

Two years with Art Pipes and no CEL.