fred388

just a wee question for the future, i have an 02 bug with a fully decatted turbo back exhaust and was gonna get the upipe decatted,
in oder for it now to pass an mot would a hi-flow race cat be enough

TonyBurns

iTrader: (3)

Welcome
What bug do you have? (wrx or sti? though im guessing wrx here)
You would need a high flow cat and a remap, that should get you through an mot

Tony

fred388

excellent cheers, its just the wrx, just something that poped into my head there, MOT not need till like nov

powerwrx

iTrader: (11)

as your car stands it wont pass an mot... in order for it to pass you will need a catted downpipe or a sports cat downpipe. failing that get yourself a 'friendly' mot tester

a remap is highly recommended if you have decatted, if it has already been mapped then you will require a map tweak if you fit a decat up-pipe

fred388

ye its going for a remap soon just waitng on my samco turbo pipe arriving as all other bits have been done, ye i was gonna go for the hiflow cat as i heard from andy forrest that he can act get more torque from one if its fitted

TonyBurns

iTrader: (3)

You may get a check engine light (cel) pop up after doing that up pipe, though its recommended to remove it as there are known cases of those exploding into the turbo

Tony

fred388

ye mine is on the now with with just decatting turbo back. remap shall sort it thought, few more pay checks needed

dynamix

iTrader: (3)

take it easy til remapped - it will be overboosting badly

fred388

aye im not booting it or anything just really cruising about at spped limits with gentlish acceleration keeping an eye on my guage

metz

Hi sorry to threadjack a little. Iam a newbie to the impreza.
I read there are 3 cats on the bug eye WRX. which of the 3 can be removed to still pass an m.o.t legally.

A mate says just leaving the up pipe cat will be fine. but i thought i would check on here first.

fred388

think it would be the one in the downpipe,as the sti versions come with a catless uppipe, or decat them all and put an sti uppipe on the get a hiflow cat put on, u still get preformance and be legal, but sure someone will be along soo to correct me

metz

Thanks for your reply fella.

dynamix

iTrader: (3)

It wont pass an MOT with just the uppipe cat. Will need one other in there - probably the downpipe cat is the easiest to leave in situ.

metz

Ah right thanks for that. so get decat up pipe and decat middle section and sports cat in the downpipe and all will be well.

then go get it mapped.

dynamix

iTrader: (3)

Perfect - that will make a great performance and driveability improvement