If I was to do the defouler mod, it tricks the 02 sensor, but if we are required to do smog (Cali), will it pass, or will they say no because of it? Cause I would really love to do a high flow cat or dp, but don't want to deal with the hassle of changing my exhaust every time i need to do a smog check. So would it pass or fail?

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2001 Audi A4 1.8T Quattro 5-Speed Manual: w/ 134,000 miles at ownership

i think you might fail horribly but thats just my inexperienced opinion... the labree HFC i have shouldnt have passed smog but it did. Talk to brent at labree motorsports about a HFC and DP

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97' 1.8TQ
*Hyperboost HXC DV*K03-s(temporary)*Neuspeed Race Springs*
*Bilstein Sport Shocks*Labree HFC*Labree DP*

YA it just tricks the sensor so you dont have a CEL. Youll fail the smog test w/ a test pipe. Best bet is put in the HFC and not have t worry about it. The hFC should remain functional, its a larger diameter to allow better flow.

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'01 1.8TQM::SpeedTuning ECU::Forge 007p::APR/VDO vent gauge::18"x7.5" Flik Wasps::15% tint::debadged
www.metrodubs.com

Yea, I was thinking HFC with the Defouler mod. If I can do this with it passing smog, then my plans for mods will be eeeexcelent!

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2001 Audi A4 1.8T Quattro 5-Speed Manual: w/ 134,000 miles at ownership