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Catless uppipe

6K views 5 replies 6 participants last post by  LW_Black4 
#1 ·
Would I fail an inspection test if I ran a catless uppipe on my 03 WRX? I know 03 WRXs have cats in the uppipe and at higher boost levels, the cat can break off and damage your turbo. Is there some way I could pass with a catless uppipe or would I have to swap in an uppipe with a cat everytime I go get an inspection? And is it true 03 WRX also have a cat in the mid pipe or it's not true?
 
#4 ·
As long as your exhaust path has at least one working cat you should come out fine on the sniffer. If you have a high flow catted down pipe you might have a tougher time but assuming everything is running normally I cant a sniffer pegging you.
 
#6 · (Edited)
Ontario no longer has a sniff test. For vehicles 1998 or later they use an On Board Diagnostic System test (OBD Test), which means if you don't have a CEL (check engine light) your vehicle will pass.

I'm in Ontario and the emissions test requirement is bi-annual.

I installed a cat-less turbo up-pipe like you to protect the turbo. We chose one with a exhaust sensor bung and re-installed the factory sensor to avoid the CEL. We still have a(nother) cat in the downpipe unless you upgrade without it (not recommended).
 
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