i bought the stillen hfc used but in good condition thinking they wouldnt throw check codes or smell i was wrong .. anybody have any info or experinces with stillen hfc? btw they sound great with the borla td and car runs harder, i did install duel non fowlers on each side aswell ,but i did notice the idle was a little low now ?

 

From what I've heard, non-foulers do nothing for '06 Gs, I didn't think HFCs would give CELs but since you do have it I don't think you'll be able to get rid of it.

I would get the CEL code checked out at AutoZone just to make sure it's actually the O2 sensors and not something else.

 

my friend has a scanner and its from the exhust .. ive had test pipes before and didnt have these problems ,wierd ? can the hfc be bad ?

 

anyone?

 

my bud installed hfc and got a cat efficiency code within 2 months this was like 3 weeks ago i reset the light and it hasnt come back on so far. only diff was on his car the idle was higher than normal after clearing the code back to normal

 

ive had the HFC for a month now and enjoyed them very much! great power gain felt like with no smell or check engine light.. but selling now due to TT so up for grabs! used for a month stillen hfc but otherwise no problems with them with engine light or smell dont know wat it could be..