What down pipe does not produce a CEL? I do not want a check engine light

 

did you mean to post this in the evo x forums? to answer your question the test pipe doesnt cause any cel's, a test pipe on the other hand will. there are ways around it, o2 spacers, and such.

 

Don't worry too much about the CEL, the real problem here is the underglow.

 

Yes I did bc I will be recieving my Evolution X in the coming days

 

so you finally were able to swallow how much insurance you're gonna shell out each month with the evo?

with all those things you did with your lancer just to make it look like an evo

i see a BOV in VTA in yer future

 

+16527883 lolzorz

 

i knew him from another forum.
everyone s him on his scavenged evo x parts but i told him before just get an evo. he said insurance was too much...c'mon, you'll forget that as soon as you drive one!

and a test pipe will bring up a cel.

 

Couldn't have said it better myself!

 

AHAHAHAHAHA OMFGLOLZORGZ I didn't see this post until now, wow. That was a low blow.

 

How about a down pipe? Will that produce a CEL?

 

I'm just messing around.

Now that I know this isn't a mis-post, the only downpipes that could potentially
cause a CEL are those like the Perrin downpipe that replaces the stock Cat. with
an HFC. HFCs and testpipes change the flow the rear O2 sensor sees, which to
the ECM means the Cat. isn't functioning properly, triggering a CEL.

And make sure whatever downpipe you go with replaces the turbo exhaust outlet
fitting (e.g. AMS, ETS, Ultimate, T1R.) The exhaust outlet fitting is 22 in the
first diagram and is also referred to as the O2 housing on the boards, although it
doesn't house an O2 sensor as it did on the Evo 8/9. Replacing just the
downpipe (9 in the second diagram) has been shown to yield literally zero
gains in power with the stock piece already being 2.75" and mandrel bent.
Upstream of the Cat., the exhaust outlet is the restriction. The only other
worthwhile alternative would be something like the Perrin mentioned above, but
only because it replaces both the downpipe and Cat. with an HFC.












This is the Perrin, essentially a long HFC: