For a while now, I have run a straight pipe on my '89 N/A and I've always had a connection when it came to passing emissions. Now that I am older these days, I am making 'modifications' to make my FC more practical and legal. I'm on a budget and, rather than buying all new exhaust, I'd like to weld new catalytic converters to my existing exhaust to get it street legal. All of my engine's emission control systems are intact and functional, I just need to modify my exhaust to pass seeing as how it is straight piped at the moment. Is there a certain catalytic converter I can weld on solo, or do I need to add two in order for this pig to pass? Any suggestions?

 

Saved the link to this after spending some time on aaroncake's site
Rotary Performance | FC Exhaust

 

I cant tell you what utah laws require for cats. Some states like CA are very strict about exhaust, NC doesnt care as long as one exists(no tailpipe test for odb-i and earlier).

 

Just know that after market cat's have a relative short life compared to the stock cats. Better to do a bolt in set up you can remove and replace with the straight pipe when you want. Best to run the cats when you want to, like for only a few days on the anniversary of when you need to get a smog check if you get what I'm saying.

 

the FC's will all pass with just the stock main cat; so i'll say one

 

magnaflow and Bonez are the only 2 aftermarket cats i bother with. magnaflow being the cheaper option that doesn't last as long as the bonez or work as hard.

 

I've passed several times with an RB header, Bonez main cat, and RB Y pipe/ mufflers. Then just put the RB silencer back on. That way the cat will last forever and never get fouled.

 

+1 On The Bonez Cat. Surprised Even The Inspector After How Bad I Had Failed Prior To It's Installation. Passed With Flying Colors When I Had My '87.

Just The Two Pennies I Offer.

 

Hmm. Then I will try the Bonez cat. There is a magnaflow setup I was checking out, but I recall installing one similar on my FB and that car wouldn't pass.