On their website, Fast Intentions strongly markets their high-flow cats designed so that they don't trip a Check Engine Light. I'm familiar with the trick of using a plug non-fouler to extend the O2 Sensor out of the exhaust stream enough to satisfy the sensor range, and I'm intrigued with FI's "J"-shaped extension... that seems pretty clever.

Anyway, I thought I'd just throw this question out there: has anyone had to deal with a CEL with a FI product, despite manufacturer claims? If so, what did you do to deal with it?

And related to that, what does the G community use for O2 Sims? I had an O2 Simulator module on my last car because I had the pre-cats gutted, and the Sim worked just fine.

 

I have not heard of any issues or seen any posts. I just received my RHFC from Fast intentions. Can't wait to have them installed.

 

I do not have the FI RHFC so I can't address whether or not they throw a code. However, for any exhaust cats or pipes that do, the situation can be remedied by placing a very tightly wadded ball of 0000 steel wool inside the bung where the sensor screws in. It has worked for me more than once.

 

Same here, so I thought I'd go fishing.

4 naught steel wool? I've never, ever heard of that one. That bears some googling.

I'm having an immediate negative response to that trick, Betty. The idea of having little pieces of steel blow-back into/through the cats is a little unnerving. However, not-a-mechanic, and it's worth researching.

 

I'm amazed that you never heard of this before now. I certainly didn't come up with it and it's not new. Assuming that it does dislodge, what potential harm do you forsee form having small pieces of metal wire travel through your exhaust system? I'm not a mechanic either so maybe there's some damage it could cause that I'm just not aware of. BTW I just noticed that I omitted that it must be stainless steel wool to avoid rust.

 

I hope these don't throw a code...I just ordered a pair of FI HFC. One of the reasons why I ordered from FI was because they advertise no codes.

Damn it Rochester....now you got me worried.

Why ya gotta go poking into these topics

 

Well, to your first, I don't get out much. LOL

It's not steel wool going out the exhaust that makes me go "Wha?!", it's steel wool getting sucked back into the engine. If a piston ring fails, you can get blow-back of exhaust gases. AFAIK, that's the only way blowback can happen. Over on Maxima.org, old engines with weak piston rings have blown because of pre-cat substrate that got sucked back into the cylinders. And even then, the only way old pre-cats could have been compromised in the first place is if the engine had once run super rich for an extended period, like with a failed coil-pack.

Like you, Betty, I'm no mechanic, so all this is just on the edge of my understanding. I could also be way wrong.

Ha ha, sorry, Matt. I want to follow your HFC purchase and install. You going to start a thread, or piggyback somewhere? My (current) plan is to get a pair of RHFCs from FI this Spring or Summer.

 

Suppose I could follow up after the install. The setup is supposed to be shipped next week. Install roughly a week after that (unless this GB for the GTM shaft goes forward). I won't be doing the install, but I'll keep tabs on if there's codes thrown.

 

I have had the FI RHFC's installed on my car for over 6 months now and the I have not gotten any CEL. I talked to Tony before ordering and he assured me that it won't happen and it hasn't happened. It's a solid product with good build quality.

 

Feel free to use this thread for your install comments, videos, etc.

What's on the tail of those cats? I see Tanabe in your sig... cat-back or axle-back?

 

It's all FI. HFC, s-pipes, 18" resonated "new style" x pipe, oval axle back...all in polished SS.

The tanabe in my sig are my coils.

 

Nice!

I'm tempted to ask you why you got those pipes in polished SS... but then you could ask me why I have titanium nuts & bolts under the hood, and we'd both just be staring blankly at one another.

 

I did get a CEL after swapping my HFC to FI RHFC on my car. It was a really cold day in san diego when it happened though, about 30 degrees. My car had kinetix HFC for more than 1 year with no cel. I also had a up rev tune but that was tuned for the kinetix HFC, stillen gen3, and ARK exhaust. It hasn't happened since i cleared it 2 months ago. One bad part of the FI HFC design is that the placement of the O2 sensors wires are left hanging with nowhere to secure them from harm. I used some zip ties to get them out of harms way, but i wish more forethought went into this. the factory wire clip locations can no longer be used to secure the O2 wires.

 

Just so it would match.....I already have the axle back in the basement.

Other than that...no other reason.

And I stare at stuff blankly enough already.

 

Good post, godzilla. 30 degrees is a winter heat-wave here in Upstate NY. Hmm.

I think it would be easy enough to weld or bolt an open eyelet clip on each side to keep the O2 sensor wires nice and tidy. Could have sworn I'd seen a picture like that recently. Industrial sized zip-ties would do the job, too. Those things would last for years.

And now Rad_Slinger is freaking out that you got a CEL with your RHFC.

Did you contact FI when it happened and ask them what's up with why that happened? I'm curious what their advice would be, considering how very strongly they claim "NO CEL" with their products.