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So I wana do custom exhaust but I wana stay legal for mission test can't decide weather I wana do 2½ or 3 how would I stay legal high flow cat? Also looking for a header
 

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So I wana do custom exhaust but I wana stay legal for mission test can't decide weather I wana do 2½ or 3 how would I stay legal high flow cat? Also looking for a header
If you modify/change your current cat in any way, it is not legal.

I moved your thread for you. Please search the other forums next time before you make another thread. Thanks!
 

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If you modify/change your current cat in any way, it is not legal.
It's not quite that simple. Specific rules vary by state, and I suppose there may be some federal rules (but who is going to enforce that? The FBI is already way too busy reading our e-mail and posts).

In Oregon it is illegal to mess with an OEM cat before a certain number of miles are on the car (I think it was 50k, or 75k), other than to replace it with another OEM cat. However, after that mileage if the cat is damaged (or crackheads stole it for the salvage) then you can replace it with an aftermarket cat.

People should look into their local laws if they are thinking of doing something like this. Of course, legal or not, running a hi-flow cat might keep you out of trouble as compared to running catless--since your car won't stink like a '63 VW Bug when you drive by the police.

I run a DCRH with an aftermarket cat. It probably is not particularly hi-flow, but I did this a long time ago when there were fewer options and not much information. Still, far better than having the stock header/cat, and my car passed the tail pipe sniff when we still had that (now they just jack into the OBDII port and call it a day).
 
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