This weekend I am going to the track and want to put a test pipe on just for a few runs. I have a 99GSR (obd2) and the factory cat has 2 02 bungs. The skunk2 test pipe I have only accomodates one. The questions are....Should I weld another bung on, should I do the temporary tinfoil trick as mentioned in several other threads, or just zip tie it up for the several runs? If I zip tie it up and the cel light comes on will the comp go into a protection mode?

 

Your factory cat should only have one o2 bung in the rear of the cat...the other is in the header.

 

The 94-99 GSR has both bungs in the cat.

 

You mean 96-99.

I forgot about that...I'm stuck in LS mode. h:

 

Well, sort of. The 94-95 GSR has the primary O2 sensor in the cat as well, but it doesn't have a secondary O2 sensor, so that would make my last statement partially false.

 

yes well the CEL will turn on, it wont do anything if the primary is in the cat, if u remove it ur a/f will be off and u might even LOSE power

 

Thanks for the response but I still dont have a clear answer. I know my cel light will trigger, and I now know my A/F will be off... What I need to know is if I should I take the time to weld another bung for 4 or 5 runs down the strip or if the tinfoil trick works as a temp fix..thanks.

 

If it was me, I'd weld a bung for future use. The tinfoil trick will be fine for a few runs though.