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  1. 2001 B5.5 V6 Who has hollowed out their cats?

    Volkswagen Passat B5 Discussion
    Just bought a 2001 B5.5 with a v6 and aparently both cats are gone. I already know all about it being illegal and I don't care about the backpressure or sound debates. I am planning to just hollow them out until I get some cash to replace them (only paid $2500 for the car). Anyone who has done...
  2. FS: Random Technologies High Flow Cat - Hollowed out (TestPipe) $100

    Classified Archive
    I had this on my B5 running with an HKS blow-off valve. I guess running rich killed the CAT. I did hear my car backfire sometimes shifting from 1st to 2nd. :P Anyways, I have removed it and hollowed it out. The piping is 2.5" diameter with a larger middle section. The piping is pretty heavy...
  3. Has anyone ever hollowed out the pre-cat/downpipe for more power on the 1.8?

    Volkswagen Passat B5 Discussion
    This was done on my Audi A6 2.7T, but they looked like they were easier to do? The shape of the 1.8 pre-cat looks problematic. I understand there is an O2 sensor relocation neccessity when doing this. Is that true?