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#29
01-05-2017, 01:18 PM
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To confirm your cats are PLUGGED up. Tap into a good source of intake manifold vacuum and insert a Vacuum gauge.
If you vac number drop as RPM increases, your down stream exhaust is indeed blocked. Drop the cats and see if the number change, because a collapsed pipe and or muffler further down stream will give you similar results. If you are really ambitious, there are pressure gauges and lines that can be screwed into the O2 ports upstream and downstream of the cats to see the drop live.
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 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green 
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