Drivetrain Header/High Flow cat advice please.
#1
Header/High Flow cat advice please.
So I'm looking to do a header and a high flow cat and need some advice cause i hear some set ups cause a CEL. Doesn't anyone have a Header/High Flow cat they can recommend. I want to avoid welding a factory cat onto a aftermarket header. I'm looking for something i can bolt on and not have to worry about since at some point I'm going to have to go through emissions.
Thanks in advance.
Thanks in advance.
#2
#7
Join Date: Feb 2010
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The RMW shorty also likes to crack around the flanges, thats what happens when you omly weld the outside.
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#9
The OBX & Megans are just fine, 99% of the time CEL's are CAT related when it comes to headers, if you went back and read my thread I stricktly chose the Mynes header for ease of maintenance, because of the heat, you WILL eventually end up with a CAT issue when useing a header, and I would rather be able to unbolt a CAT than pull a header, and yes so far the factory CAT's have been holding up the longest. So IMO I would chose a design that uses a bolt on CAT.
As far as RMW's shorty and the Mynes V2 being mentioned so prevelently, they both have the reputation of being the prefered choices as far as performance goes, esp. with more heavily moded cars, but any of them will give you a bump in performance & sound depending on what you're after.
As far as RMW's shorty and the Mynes V2 being mentioned so prevelently, they both have the reputation of being the prefered choices as far as performance goes, esp. with more heavily moded cars, but any of them will give you a bump in performance & sound depending on what you're after.
#11
I had RMW's race header and high flow cat with on problems until I had to have it smoged (Calif). How I have the same header with the stock cat and I like it better and it passed smog in good shape. The sound got deeper and I haven't any power loss because of the cat.
Last edited by checkers; 11-05-2011 at 02:58 PM.
#12
I have been running an Alta header w/hi-flow cat and an Invidia catback exhaust system on my R53 for the last 2 years and have been very happy with the sound and performance... I have been getting an intermittent CEL light for the last couple weeks and when I took the car in for annual inspection the code popped up that I have a bad CAT...
I would like to just replace the CAT, but have no idea of aftermarket alternatives. I know the the header will have to be removed, the old CAT cut out and a new one welded in place, then reinstalled...
What are my options at this point?
Can anyone recommend a replacement CAT?
I would like to just replace the CAT, but have no idea of aftermarket alternatives. I know the the header will have to be removed, the old CAT cut out and a new one welded in place, then reinstalled...
What are my options at this point?
Can anyone recommend a replacement CAT?
#16
I want to replace the CAT on my existing Alta header. Any info on a suitable replacement CAT would be appreciated.
#19
Thanks for the info... I've checked out the Random Tech CATs from the reference earlier in the thread and the look good... I just need to match dimensions when I get the old one out...
#21
Personally would go with the RMW street header. There were some CEL issues when they first came out, mine had one shortly after buying one of the first batches, but Jan sorted it out and it's been code free for almost 4 years! As far as I know, RMW is the ONLY company that actually fixed their header so as to be code free.
#22
Maybe I'm missing it, but RMW doesn't list a street header on their website... The only headers listed are not for street use...
Even so, a new header / cat combo is going to run $800 - $1400... The price of cutting out the old CAT and welding in a new one will be much less and if the Random Tech units hold up, I'll be good... If not, I will get another 2 years of use before another failure...
Even so, a new header / cat combo is going to run $800 - $1400... The price of cutting out the old CAT and welding in a new one will be much less and if the Random Tech units hold up, I'll be good... If not, I will get another 2 years of use before another failure...
#23
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OP: I see your point of trying to save money with just replacing the cat, thats why I'm helping you out. RMW's street header is avalible on Detroit Tuned's web site, or with a phone call to the manufacturer. They are a little more pricey but the service and support is worth it when your ALTA fails again. Last I checked, (and I know mine came with one) They use a Random Tec cat.