Well I've done some searching and even tried contact Vast Performance twice (no reply) and I have a few questions.

My Car: B5 2001 Audi S4

I know I would need two of these CEL eliminator but where are they installed?

Do they require welding on the exhaust system?

Or do they install in the post cat O2 sensor holes. And if that's the case where do the O2 sensor install?

I've read about the spark plug spacer/washer trick but that seems like you increase your chance for exhaust leaks.

And yes I'm asking about this because a friend of mine talked me into cleared my cats while I was getting the RS4 clutch installed. So all of you with experience let me know what my options are and or any other suggestions. Thanks!


http://vastperformance.com/shop/prod...products_id=68

 

the go post cat...and just screw in the bung, then the o2 screws into it....no welding, easy job

 

That's what I thought they did... Funny I also just got a email back from Vast... figures. Anyway I got those order and hopefully I'll be able to install them next weekend.

Thanks!

 

You can get something similar from Advance Auto Parts that will cost you like a total of 9 bucks. There called spark plug defoulers. VAST kinda rips people on Celiminators...

 

that and some welding and drilling are also needed, but yeah you can get it at pepboys or ebay.