[Official] "Do I need a tune with bolt-ons?" thread

[1st]

Originally Posted by DEpointfive0

... You shouldn't get a CEL with HFCs, CAIs, and a CBE if your installs went correctly.

........Really come on now pal. HFC I’m not talking about. I know the HFC will throw a cell unless you have the bung or tune. I’m talking about just CBE/CAI and KEEPING THE CATS. There are threads on this forum that people are stating they are throwing a cell with just 2 breather mods with no vacuum leaks and having the mass air flow sensors cleaned with cleaner. So this is why I’m asking in theory there shouldn’t be a cell thrown. Also I have read a lot of threads stating you didn’t tune. What are your mods?