branko

I have decided on getting a Car Sound high flow cat.

I want a 2.25" with O2 bung. They have a few different models, and Im not too sure which one would be the best to go to.
I want to keep the velocity/flow as high as possible.

Im considering the:
- 94000 universal series
- 94100 shorter universal series


- 53000 Series - small footprint


Im thinking the small footprint would have the least catalitic material and doesnt increase pipe diameetr much, so flow and its velocity will be the least affected.

branko

Random tech cat is similar to the small footprint one in shape/size...

TimeRacer

Both of those carsound cats will work. Get the ones with No air bung and have it welded into the piece as our O2 sensor is on the wrong side compared to the Carsound ones.

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branko

Yeah, I was told by my muffler shop to get one without and they will fit one exactly at the spot I need it to be on.

I realise both will fit, but which ones will give me higher performance gains...Im thinking the smaller round one....

TimeRacer

You won't notice any performance difference between the two. Possibly the 53000 series will provide a little benifit but it'll be incredibly neglidgeable esp if you're using off the shelf components. The 53000 has less of a posibility of passing smog if you have those tests.

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MC_HondaRacing

Get the larger one. The monolith inside the converter is a major restriction, so the larger cross sectional area will reduce the pressure drop across the converter significantly. I've seen this proven out in several tests. Though to look at it from a practical standpoint, it might only be a few horsepower, and you probably won't feel it.

In spite of what I just said, I intend to get the 53000 series cat because it will fit into the OEM heatshield and emissions inspectors won't pick it out.

Artifex

I already bought what you are looking for, here is my rationale:

You want an oval-body unit, they flow better than the round units. If you want to pass emissions, I purchased the longer of the 2 models. I have a custom exhaust piping, so the extra length is no problem for me. I also bought the 2-bung version (without air feed), because then I don't have to weld any bungs on it. I can just flip the converter around, and the bung will be on the correct side. Plus, I had a WBO2 sensor I installed, so the extra bung came in real handy. The 2-bung unit comes with a steel plug in one of the holes, so if you don't use one of them it's already taken care of.

I purchased the model 94065.

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branko

I dont need to worry about emissions at all. No test where I live.

So from what you guys are saying the shorter wide one is the best as it has the greatest cross-secton yet least amount of honeycomb to go thru?
Thus creating the least amount of backpressure?

Kool-Lude

^^^I purchased model 94165...in theory this should flow the best for a 2.25" cat, plus you have 2 bungs to play with.

Though, keep in mind that with the shorter model you will have to "add" some length to it if you're planning this to be a direct bolt-on replacement for the stock cat. This is not an issue as long as it's done right.

Can I ask what the cat will bolt to...header and exhaust?

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branko

excelent. Looks like I know what to buy now

I have a JDM header (one with big downpipe and 60mm collector) I will be modifying the flex pipe etc to be the same size, going into 2.25" cat and catback. I have a Remus bolt-on muffler.

SXDAl

2.5" is closer to 60mm than 2.25"

branko

I contacted carsound about getting flow rates for the 3 series and this is what they said:

"Thanks for your contact. All of our converters flow pretty much the same - 30-40% better than an OEM unit. We do not disclose any specific cfm data or other flow specs, and that is just simply because there is no industry standard for doing so. However, I can tell you that our ceramic bricks contain 400 cells per square inch. The 53000-series is a lower-rated cat than the 94000-series, so the decision should really be based on the type of vehicle you have."


And second email: (94100 vs 94000)

"Those flow the same - the 91000 is just a short-body version of the 94000(by 3") and is meant for cars that would have clearance problems with the standard 12" 94000-series. But either one of those is really overkill for your car, unless you have some serious motor modifications. A 53000-series is more appropriate for the Prelude, and it flows just as well. Thanks for your interest in Magnaflow."

Artifex

I don't know about "overkill." I don't think it really matters, because the last time I checked the pricing was about the same. If I can have the performance of the 94x series at the same price as the 53x, why would I bother with the 53x?


Incidentally, I got this cat off of an ebay seller brand new for like $36. Genuine Magnaflow.

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