WRX up pipe, necessary?

JamieKerry

Sunday Drivers
I am pretty much a newbie to the world of Subaru's, just got myself a 2006 PPP wrx , 2 litre turbo and love it so far. Been reading as much as I can online with regards to the up pipe but need some more definitive answers.
Is it necessary to decat the up pipe?
How likely is the cat going dissolve and get sucked into the turbo?
Will I require a remap after?
Will it pass an nct with a decat up pipe only?

Thanks in advance for the help :notworthy:
 
Pre cat defo should be removed and replaced with sti up pipe I got one on here few years ago 50 quid.

As regards if remap after unsure I did it along with other mods before map

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If still retaining both downpipe decats. Or with PPP then the sports cat. Then no map will be required.

Yes car will pass nct with this removed.
 
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