Headers make a difference?, Headers? "High Flow" cats? some one help! 94 ST Options

[mgnt232]

I Have a 1994 Toyota Celica ST 1.8L 7A-FE
I recently had a Magnaflow "catback" installed.

I was looking into getting headers when i came across something interesting.
I saw that in order for the headers to give you car the extra power, you need to have a high flow catalytic converter. I am not sure if this is true, but i believe it is because the extra flow, from the headers would be slowed by the restrictive stock cat? am i correct? (the cat back is not restricted any more, with my new magnaflow exhaust system)
And if this is correct, would these two things match up?

The cat i am looking at ( http://www.planetmagnaflow.com/mfcatsearch...catmodel=CELICA ) !*The first direct fit one*!

The headers i am looking at ( http://cgi.ebay.com/ebaymotors/ws/eBayISAP...alenotsupported )

Are headers worth it? do i need the new cat? would it be better? with the new cat, is it worth it at all? ive never seen the difference, but im assuming alot of you have, so any one with any info, please give me some answers. thanks!-

[k-weaver]

Getting a Header is totally worth it, I have one on my 96 GT and noticed a difference right away. Don't get me wrong, it didn't add much but enough to notice (maybe 3-5hp). The header I have was a cat delete and since mine is OBDII I have two cats (just one since the header). The one left is not a high flow, I suspect if I removed it or replaced with a high flow it would add a noticeable increase in power (maybe 2-3hp?).

So bottom line, getting the header is totally worth it IMO. Just do your homework first, ask around and see what other people have gotten that did and didn't work. I know you don't have a GT but here are some issues I had when I got mine:

1.) Using stock gasket (metal one) I had a leak (had to use an aftermarket one)
2.) Bolts that it came with didn't fit in the stock flex pipe (bolts too big for the hole)
3.) Unable to pass smog in CA (because i'm missing a CAT, I have to swap it every two years)
4.) The shiny stainless steel slowly changed colors from bright gold, to blue, purple, then a nasty mix of all three