hfc's or test pipes
 

I just wanted to know if any wanrning lights will pop up if i install either of these ? and if so does anybody know if "mill elliminators ?" are made to prevents this and, knew where i could buy some

HFCs don't usually throw CELs. Test pipes will, depending on what year car we're talking about. I don't know what a mill eliminator is. We use O2 sensor simulators (electronic) or spark plug defoulers to keep CELs from activating.

Yes,Yes,and search!

Berk HFC wont throw CEL = )

Neither will test pipes with a nonfouler.

My HFC's threw a cel--but nonfouler did the trick

High-flow catelitic converters? 10 percent chance.

Test pipes? Search "non-fouler."