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The mkiv Supra Owners Club

Difference between 1 cat and no cats


mawby
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Just a quickie for anyone out there who's previously taken one cat off of their car, and at a later date taken the second cat off. Did it make a real difference to performance? I currently have the second cat removed and have been thinking about also removing the first, but I don't want the expense if it's not worth it.

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I ended up doing mine a cat at a time because I got sent the wrong front pipe to begin with... my summary:

 

1 cat removed = :)

 

2 cats removed = :D

 

 

You could definately tell the difference with 2 out over 1 and the exhaust note was nicer too (with NuR at least) - performance increases might be minimal but perceived gains are huge :cool:

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Originally posted by qaisar

but what about if using a boost controller to up boost, is it worth removing the 1st cat in those circumstances?

 

Absolutely, yes. The removal of any restriction to breathing is good, especially one that acts as a heat sink and also work on an exothermic reaction priciple, so get rid of it :D

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