I think that one is physically inside of the exhaust manifold, if I have interpreted this correctly.
stock manifold - 6G Celicas Forums
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Yeah there should be. Just take off the heatshield and look. And if for some reason there isn't one inside the manifold, don't worry because if you're putting in an aftermarket header, it'll be gone anyway
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Hm, I guess they changed it. I have two and I'm OBDI
QUOTE (Arsaces @ Nov 17, 2010 - 9:21 AM) 
>I think that one is physically inside of the exhaust manifold, if I have interpreted this correctly.
Yeah there should be. Just take off the heatshield and look. And if for some reason there isn't one inside the manifold, don't worry because if you're putting in an aftermarket header, it'll be gone anyway
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QUOTE (96stgreendemon @ Nov 17, 2010 - 9:14 AM)
>My st only had one cat, its right before the resonator..... and im obd2
Hm, I guess they changed it. I have two and I'm OBDI
taking too long to mod since '09June '12 COTM'95 AT200
i lost all my low end torque when i put my 2.5in cat-back, but gained it up top, if ur just going to keep the N/A setup prob do 2.25" .. and just run to advance auto and grab a cherry bomb glasspack res, thats what i did, it was like ~20 bucks and sounds great with my meagan racing muffler. i also got rid of my cat. i will say this with my ebay header, 2.5"cat-back with glasspack res and meagan muffler my 5s sounds mean, i get lots of compliments on it.
st205 powered ss3 coupe
the cat issue depends on where the car was originally bought and/or assembled... my celica is an ST and it only had one caty, my brother has a civic of the same year, bought from the same dealer, with 2 cats.... it all just depends on where the car was built to be sold.. im pretty sure all cali models have 2 cats... the cat thats "inside the stock manifold" is really just built into it with flanges. if u take it out your stock exhaust will not fit back on the car bc u will have a huge gap.
forgot to mention mine was a Cali spec.