Building my own RHFC for half the price of FI or Berk..
Which is a good thing. 300 CPSI is not as a great a flowing cat as a 200 CPSI.. The more cells per square inch is directly proportional to more restriction and backpressure in an exhaust system. That being said, the ones I'm after aren't as high flowing, they are rated 400 CPSI, Im not set on these, still researching and finding what's what..
Flowmaster PN - 2230125 - 223 Series - Rated at 400 CPSI.
I found some Magnaflows PN - 59956 that are rated at 200 CPSI but ultimately I'll have to wait to get the test pipes and get some measurements before I know which cats to order. I'll update this later when I do.
Flowmaster PN - 2230125 - 223 Series - Rated at 400 CPSI.
I found some Magnaflows PN - 59956 that are rated at 200 CPSI but ultimately I'll have to wait to get the test pipes and get some measurements before I know which cats to order. I'll update this later when I do.
You must understand FI works very closely with Specialty Z during their R&D.
They must have a reason to go with 300s.
Velocity, not flow determines evacuation efficiency. (unless you are talking open headers!!)
Just like a 3 inch exhaust "flows" better than a 2", but the velocity is not as great.
You must understand FI works very closely with Specialty Z during their R&D.
They must have a reason to go with 300s.
Velocity, not flow determines evacuation efficiency. (unless you are talking open headers!!)
Just like a 3 inch exhaust "flows" better than a 2", but the velocity is not as great.
They must have a reason to go with 300s.
Velocity, not flow determines evacuation efficiency. (unless you are talking open headers!!)
Just like a 3 inch exhaust "flows" better than a 2", but the velocity is not as great.
Registered Member
Joined: Oct 2014
Posts: 128
Likes: 6
From: Denver, CO
The rating may have to do with catalyzing efficiency.
Catalytic converters work by heating up to a high enough temperature for the catalyst inside them to function properly. All things being equal, a lower density cell count would improve flow, but would not allow the catalyst to function as effectively as a higher density cell count.
It's a compromise that I think everyone contemplating high flow cats has considered. "How free flowing can I get and still pass emissions...?" For our vehicles I don't think it's ever been answered (or at least I haven't been able to find it).
Are you planning on passing emissions with the high-flow units?
*Please do not turn this into a discussion about backpressure.
Catalytic converters work by heating up to a high enough temperature for the catalyst inside them to function properly. All things being equal, a lower density cell count would improve flow, but would not allow the catalyst to function as effectively as a higher density cell count.
It's a compromise that I think everyone contemplating high flow cats has considered. "How free flowing can I get and still pass emissions...?" For our vehicles I don't think it's ever been answered (or at least I haven't been able to find it).
Are you planning on passing emissions with the high-flow units?
*Please do not turn this into a discussion about backpressure.
The rating may have to do with catalyzing efficiency.
Catalytic converters work by heating up to a high enough temperature for the catalyst inside them to function properly. All things being equal, a lower density cell count would improve flow, but would not allow the catalyst to function as effectively as a higher density cell count.
It's a compromise that I think everyone contemplating high flow cats has considered. "How free flowing can I get and still pass emissions...?" For our vehicles I don't think it's ever been answered (or at least I haven't been able to find it).
Are you planning on passing emissions with the high-flow units?
*Please do not turn this into a discussion about backpressure.
Catalytic converters work by heating up to a high enough temperature for the catalyst inside them to function properly. All things being equal, a lower density cell count would improve flow, but would not allow the catalyst to function as effectively as a higher density cell count.
It's a compromise that I think everyone contemplating high flow cats has considered. "How free flowing can I get and still pass emissions...?" For our vehicles I don't think it's ever been answered (or at least I haven't been able to find it).
Are you planning on passing emissions with the high-flow units?
*Please do not turn this into a discussion about backpressure.
Yes, I agree, lets keep it to the topic at hand.
Yes, I'd like to have a somewhat clean* running car but also using as high flowing as possible exhaust before throwing a code and triggering a CEL/SES. I don't have emissions in my state but DO care about the environment enough to at least run a cat of some kind. Just want to meet in the middle somewhere.
Yep, I bought the high flow cats above from Magnaflow and measured everything to fit. Another HUGE hobby of mine is mountain biking so I bought another bike and bike rack, I'm just paying off/down my credit card for a few more weeks before I get back into modding the car. I'll update this when I get them welded and tackle the install. I'll probably do the CAI, pulleys and cats at the same time..
Registered Member
Joined: Jul 2014
Posts: 40
Likes: 7
From: DFW Texas
Do the Magnaflow cats you bought have a metal or ceramic substrate? The metal substrate will hold up to higher temperatures than the ceramic. Also the metal substrate material is thinner than the ceramic and so will have less flow restriction for a given cell count.
Registered User
Joined: Oct 2015
Posts: 124
Likes: 13
From: Calgary, Alberta
Yep, I bought the high flow cats above from Magnaflow and measured everything to fit. Another HUGE hobby of mine is mountain biking so I bought another bike and bike rack, I'm just paying off/down my credit card for a few more weeks before I get back into modding the car. I'll update this when I get them welded and tackle the install. I'll probably do the CAI, pulleys and cats at the same time..
Sorry for the delay guys, I went the catless route all together and installed the resonated test pipes by themselves. This would totally work and be a very easy job for an exhaust shop, still cheaper than RHFC's too. Hope someone does it!
I'm heading back to my 2JZ roots and selling the car, otherwise I would probably go ahead and do this just for kicks.
I'm heading back to my 2JZ roots and selling the car, otherwise I would probably go ahead and do this just for kicks.
Last edited by Kris9884; Aug 18, 2017 at 11:33 PM.
For anyone looking for HFC Kentix Racing has them available for about $400 shipped.
KHFC-370Z/G37 - Kinetix Racing High Flow Cats - Performance Auto Parts - Car and Truck Accessories | JM Auto Racing - Intensify Your Ride!
KHFC-370Z/G37 - Kinetix Racing High Flow Cats - Performance Auto Parts - Car and Truck Accessories | JM Auto Racing - Intensify Your Ride!
