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  1. #1
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    Cat Positioning....

    I notice that certain HFC's have the cats in the same place as OEM (a la Fabspeed) and some have them further back in the x-pipe (akra). What, if anything, is affected by cat placement? Are you less likely to throw a code w/ the cats closer to the motor? how is performance affected, sound, etc?
    Last edited by GBX; 08-14-2010 at 12:28 PM.

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    Having them further upstream allows them to heat faster, better for emissions. The X-pipe's still having cats but in slightly different places won't have a big effect.

    If you have a cat before the sensors you won't throw a code. If you delete it, you will have to move the sensors or turn them off as you will get a CEL.
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    Thanks Sticky! So fabspeed's setup would be less likely to throw a code then Akra.

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    Click here to enlarge Originally Posted by GBX Click here to enlarge
    Thanks Sticky! So fabspeed's setup would be less likely to throw a code then Akra.
    If it has a cat in about the factory location it won't throw a code. If it is deleted, it will.

    I recommend a tune anyway.
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    I was under the impression if the Cat is pushed up more it will give more kick but less flow.
    so if the cats are up close you should create less HP but better low end.
    Also if the cats are pushed up more the car is quieter. muffles the sound better
    some say the Fabspeed stil throws lights but I don't know I have never used a Fabspeed xpipe before
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    Never thought cat placement would have an effect on HP. Good info to know.
    Click here to enlarge

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    Click here to enlarge Originally Posted by 05m3smg Click here to enlarge
    Never thought cat placement would have an effect on HP. Good info to know.
    It can, in the US E46 M3 they put a cat right into the header which robbed HP. Eliminating that cat made a nice difference in power. Basically, where a cat is won't have as much of an impact as removing that cat completely.
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    if you get fabspeed hfc you might throw a code but i could clear it self sometimes...i had my fabspeed cats throw codes after 3000 miles went away and came back.

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    Click here to enlarge Originally Posted by akh23456 Click here to enlarge
    if you get fabspeed hfc you might throw a code but i could clear it self sometimes...i had my fabspeed cats throw codes after 3000 miles went away and came back.
    How many cell? 200? 300 should be fine but under that and you will throw a code from time to time.
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    How many cell? 200? 300 should be fine but under that and you will throw a code from time to time.
    200 cell it will throw a code sooner or later

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