Three hours on a lift and everything is in. I was very impressed with the fit and finish of all three pieces. Only gripe is that the cat should be o-ringed or at least come with the needed gasket. After four hours of driving, I got the CEL. I'll install the defouler next chance I get. The sound is great, and much lower than I expected.

 

congrads! any noticeable difference in power gains on the low-end of the rpms? any dyno runs in the future?

 

Congradulations on your mods !!!!

 

I got the CEL. I'll install the defouler next chance I get ???????

^im confused with the above

i have the evo 2 installed as well and absolutly love it, the rt cat and competech header are on there way also!!

what do the gains look like?? are they noticable?

 

You will find out when you have it install, you will love it.

Prepare to get a defouler as most ppl w/ HFC has CEL.

 

The TSX ECU has very strict parameters for exhaust flow so when it sees more flow than it likes it throws a CEL for Catalyst Efficiency Below Threshold P0420. You can just add a defouler (basically an extension for the 02 sensor to push it further away from the exhaust stream) and it will eliminate the CEL. I have them for $20 shipped for straight defoulers or $30 for the angled one or you can make your own for like $8-$10.

 

If you buy them, you need to drill them out slightly with a 1/2" drill bit otherwise the O2 sensor will bottom out. I'm still trying to find my set that I bought b/c I'm clearing my codes now 2-3x per week. I think it has to do with the winter mix gas here. Didn't happen at all in the summer.

 

The Evo 2 is really loud when new. After a week or so, the exhaust will sound a lot better. At idle, you probably wouldn't hear it outside the car unless put your ear closer to the exhaust.

Question: Will I get a CEL for having an Evo 2 and a header or does the cat usually cause that problem?

 

First, if you have an 06-08, no real reason to get the RT cat. Secondly, it is the cat that is causing the CEL, not the header or exhaust. For us 04-05 folks, the header and cat are the choking points.

 

Oh...I have an 05. I think I might just get an 06 cat and a new header =D

 

I also has an angled defouler, it was made by a guy from CRSX forum. Everyone claimed their CEL has been eliminated (on RSX); when I installed mine, it does DELAY the CEL, but it comes back in like 2-3 weeks.

I don't know for others, but for mine, it's funny. The CEL only pop up when I drove @ a steady speed + low rpm range (under 3K); an e.g would be driving 100-120km/h on hwy. When I drove aggressively, step in/lift of the gas ofteh, it won't pop up.

 

So, I have the RT cat installed for the last 6-7 months, with a cell thrown every 100 miles. Time to try a defouler.
Do we have a definitive thread-size for our TSX ?

 

By any chance you happened to know the cells # difference between 04-05 & 06-08?

 

04-05 = 900 cells

06-08 = 400 cells

 

Thank you! this difference is significant! and high flow cats is about 200-300 cells depends on brand. this makes me a 2nd thought about getting a high flow cat.

 

nope (an o2 bung is standard part)

just pm excelerate bout it... if you need one

 

installed the rt cat and defouler back in oct/nov 2008, haven't had a CEL yet.

 

Thanks! i'm on it.

 

it would be better if 03 -05 euro get the 06 - 07 cat installed ? other than getting the high flow cat

 

ive had a couple cars like that. with the varying rpm around town it can't take as accurate a sampling as it can in steady driving.

 

congrats on the full system. any pictures?

 

Sounds sweet!! I have the same set-up. I don't even remember if I have a defouler on my RT CAT, and it works fine. I didn't want to bother w/ the trouble hence why I didn't do the straight pipe!!