Jump to content
SAU Community

Catco Metal Cat Or A Metalcat Converter!?

steveo_r33

By steveo_r33,
in Engines & Forced Induction

 Share

Recommended Posts

steveo_r33 Proficient

steveo_r33

Posted
Posted

Hi guys,

I have split front s steel dump / front pipe running into my 4" HKS Hi Power Exhaust into a standard catco cat converter.

I can get the CATCO Metal Cat 4" Catalyic Converters at a reduced price from a friend and they claim to flow at 1054 CFM

or I can buy a METALCAT 3.5 Inch Cat Converter and have to run 1/2 inch reducers to make it fit. (they dont make 4")

I think going down in size is stupid and i should go with the catco even if their CFM claims may be a bit overrated.

I need some advice guys.

Thanks

saliya Rising Star

saliya

Posted
Posted
Hi guys,

I have split front s steel dump / front pipe running into my 4" HKS Hi Power Exhaust into a standard catco cat converter.

I can get the CATCO Metal Cat 4" Catalyic Converters at a reduced price from a friend and they claim to flow at 1054 CFM

or I can buy a METALCAT 3.5 Inch Cat Converter and have to run 1/2 inch reducers to make it fit. (they dont make 4")

I think going down in size is stupid and i should go with the catco even if their CFM claims may be a bit overrated.

I need some advice guys.

Thanks

Hey,

I don't know that the claims are overrated; if the cat is the one I'm thinking of the actual area of

flow through the cat material is more like 6". Does it look like this:

post-14974-1175308385.jpg

You might be able to cut the ends off the metalcat cat to get a true 4" cross-section; I don't know.

Regards,

Saliya

steveo_r33 Proficient

steveo_r33

Posted
  • Author
Posted

hey mate .. I am not actually sure what a 4" catco metal cat looks like... but i can get them cheaper...

if thats what they look like lol f**k yeah thats huge.

anyone on here use the catco's???

BHDave Grand Master

BHDave

Posted
Posted

I do. But as said earlier, all of the metal substrate cats are much the same

The size is the diameter of the center section, not the inlet and outlet size, so a 4 inch is 4 inch center section, it could still have 2.5 inlets. they are available in a variety of inlet sizes and centre diameters when not flanged. Bolt on ones are usually 3 inch in/out to suit the stock flanges.

rb26s13 Mentor

rb26s13

Posted
Posted (edited)

4inch in/out metal cat with 5inch body

Wazfone139.jpg

also if you got the 3.5 i cant see it making any restriction as you said your runing a split dump/front.. so you've obviously got a largish low mount.. 3inch flows plenty unless your making more than 450-500hp at the treads.. i cant see the smaller one being any restriction

Edited by rb26s13
steveo_r33 Proficient

steveo_r33

Posted
  • Author
Posted
4inch in/out metal cat with 5inch body

Wazfone139.jpg

also if you got the 3.5 i cant see it making any restriction as you said your runing a split dump/front.. so you've obviously got a largish low mount.. 3inch flows plenty unless your making more than 450-500hp at the treads.. i cant see the smaller one being any restriction

what sort of cat is that? looks the part!

If i get a 4inch in / outlet cat converter I wont need to take it to a muffler shop to have it fitted because I wont need to mess around with inlet / out sizes, just gaskets and maniseal!!!

Plus a 4 inch in / outlet cat is bloody huge..

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • brillo
      Leak from Tokico BM50 Brake Master Cylinder

      By brillo · Posted

      Hi, SteveL Thank you very much for your reply, you seem to be the only person on the net who has come up with a definitive answer for which I am grateful. The "Leak" was more by way of wet bubbles when the pedal was depressed hard by a buddy while trying to gey a decent pedal when bleeding the system having fitted the rebuilt BM50 back in the car, which now makes perfect sense. A bit of a shame having just rebuilt my BM50, I did not touch the proportioning valve side of things, the BM50 was leaking from the primary piston seal and fluid was running down the the Brake booster hence the need to rebuild, I had never noticed any fluid leaking from that hole previously it only started when I refitted it to the car. The brake lines in the photo are "Kunifer" which is a Copper/Nickel alloy brake pipe, but are only the ones I use to bench bleed Master cylinders, they are perfectly legal to use on vehicles here in the UK, however the lines on the car are PVF coated steel. Thanks again for clearing this up for me, a purchase of a new BMC appears to be on the cards, I have been looking at various options in case my BM50 was not repairable and have looked at the HFM BM57 which I understand is manufactured in Australia.  
    • Gantai
      R33 GTST Steering Rack (49001-19U05) Rebuild?

      By Gantai · Posted

      PXL_20250828_063541093.TS.mp4
    • Gantai
      R33 GTST Steering Rack (49001-19U05) Rebuild?

      By Gantai · Posted

      Well the install is officially done. Filled with fluid and bled it today, but didn't get a chance to take it on a test drive. I'll throw some final pics of the lines and whatnot but you can definitely install a DMAX rack in an R33 with pretty minor mods. I think the only other thing I had to do that isn't documented here is grind a bit of the larger banjo fitting to get it to clear since the banjos are grouped much tighter on the DMAX rack. Also the dust boots from a R33 do not fit either fyi, so if you end up doing this install for whatever reason you'll need to grab those too. One caveat with buying the S15 dust boots however is that the clamps are too small to fit on the R33 inner tie rod since they're much thicker so keep the old clamps around. The boots also twist a bit when adjusting toe but it's not a big deal. No issues or leaks so far, steering feels good and it looks like there's a bit more lock now than I had before. Getting an alignment on Saturday so I'll see how it feels then but seems like it'll be good to go       
    • PranK
      R35 GT-R production ends after 18 years

      By PranK · Posted

    • SteveL
      Leak from Tokico BM50 Brake Master Cylinder

      By SteveL · Posted

      I don't get in here much anymore but I can help you with this.   The hole is a vent (air relief) for the brake proportioning valve, which is built into the master cylinder.    The bad news is that if brake fluid is leaking from that hole then it's getting past the proportioning valve seals.   The really bad news is that no spare parts are available for the proportioning valve either from Nissan or after market.     It's a bit of a PITA getting the proportioning valve out of the master cylinder body anyway but, fortunately, leaks from that area are rare in my experience. BTW, if those are copper (as such) brake lines you should get rid of them.    Bundy (steel) tube is a far better choice (and legal  in Australia - if that's where you are).
×
×
  • Create New...