they act like a mini cat and give the correct flow so to speak and the o2 senor cant see a fault or out of range issue- this is roughly how it was explained to me
Thanks for your replies MYVESSV8 and 07GTS,
So these gadgets are usable on the pre and post sides of the cat converter in an Alloytec SV6, and help to disguise or "even-out" the range of "changes" in AFR with the after market extractors/exhaust system etc. ?
Thinking laterally, would one of these disguise a faulty O2 sensor?
Sounds neat to me. Like all good things - Are they illegal?
All-round, are they a better fix compared to turning sensors off in the ECU, considering the cost of an ECU tune?