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!-

[match220]

I hope you aren't getting angry with my rebuttals, I just don't want you to see what everyone else is selling or using and think that is the best option. There is a reason why dragsters use stainless, there is also a reason why they still have distributors on their cars when distributor-less ignition systems are faaaaaaar better than distributed systems. They use distributed systems because they are simple and easy to troubleshoot and repair before a race, or if something goes wrong it's easy to fix. Maybe they use stainless because they've test it on a dyno against titanium or ceramic coated setups and the difference is only 5 - 10 hp on a 8000 hp nitromethane dragster, since not much heat is lost in the 3 ft exhaust system they have, they don't bother with spending $1k more on a header that will give them 10hp, or 50 hp, or whatever, in the end what's 8000 hp compared to 8050 or even 8100 hp?

All i'm saying is, on a street car, stainless steel releases too much heat on the whole exhaust system, I have stainless 2.5 inch piping on my car, because it's cheap. People do advise against using stainless exhaust manifolds on a turbo application though, this has to do with the expansion of the metal dues to high heat and the welds cracking because of the properties of the stainless steel.

Anyway man, we cool? I don't want to get on anyone's bad side..