Engine which headers?

which headers?

When the heck will DC sports releases the corolla headers? Or, can the celica GT headers fit into corolla 1zz?

Or do u guys have other kind of headers that do improve?

There's always the header by JP Performance

i have KBD.. they are ok

Yep, I think that these are the best on the market right now (at least for a S/C car).

I would say go with JP. They are a great company showed amazing service to everyone in the gb and gave great deals. I dont think there was one complaint by any matrix or corolla guys. Has anyone from the boards seen a gb go so well. I guess it was a combination of good organizer and a good company though.

JP's the best for sure. Just installed mine last night... It truly is a state of the art, beautifully engineered header. Perfect fit, well built and CNC machined smooth inlets and collector, ceramic coated inside and out.
I also removed the large ridge on the lower half of engine's exhaust port outlets, enlarged another 1/16" all around and smooth bored down to the split (about 1 1/2" deep). So the outlet is now about 1/4" larger in diameter, and still almost 1/8" smaller than header inlet diameter...
Now she really runs strong, cool sound too! 8) and it only cost me $406.84 Cdn$ total!

questions

so the 02 header on the website is the same as the 03 header right? :?:

dominators got some good experience with the JP Header. I wish I can have one too, but they're not CARB approved. The header itself is like $350, which isn't bad. From what I hear of its performance, I could go for something like that. Even if they're not CARB approved, I feel they will pass emissions regardless. Maybe just the initial visual inspection may not pass.

http://matrixowners.com/modules.php...&t=27194&sid=5b3326baef715809f564dd77e43f1063

people are gettin their CAT killed after installing the JP header??
hmm...

Read the entire thread - the problem isn't the header, especially since a header isn't going to affect the cat.[/b]

Yeah, it's not the header, it's people's A/F ratio that's killing the cats.

I say let the cat go bad and then get a high-flow one put in :wink:

Damn dude, how much performance gain did you feel cause I can do this myself. Can't wait to P&P my extra head and port-match the headers and custom intake manifold for some serious air flow :twisted:

Chris we should start playing with my car too

Ok so JP header is the best to get. Now, since I won't be able to get s/c anytime soon (since I live in Australia, forget it pal, parts are so crap here had to import AEM from USA), so i will have N/A set up. What is the best cat back diameter for 1zz-fe? I think 2' should be enough for this engine, but what do u guys think?

And where can i buy JP Header from?

2.25" with a naturally aspirated setup. That's what most people got. Some have 2.5" but nothing bigger than that or lose too much backpressure.

Well, I had already removed the ridge and polished it a bit a while ago, with some improvement. I did a more thorough job and enlarged a bit more when I installed the header, for a substantial improvement. So I can't really say how much was gained from what... I had already installed a CAI. Then, I smooth bored the TB with coolant bypass, removed flaws and enlarged intake manifold's outlets to match intake ports, and polished intake ports down to injector bulge tip, also about 1 1/2" deep. Working the intake gave me more gain than with the CAI alone. I also have a 2" Cherry Bomb muffler welded on stock exhaust. All this gave me a really strong runing N/A setup for little cash. I do have a bit more low end torque now and a good wide powerband...

It makes me wonder why is 1zz TB manifold is made from plastic.

Weight reduction and cost. My mom's old 1995 Olds 88 LSS with the 3.8L V6 had a plastic manifold.

Trav

so anyway, where can i buy JP header from?

www.jpperformancellc.com .............just call them and ask for eric, he's the toyota guy.

Let them know that you found out about them from vvt-i.net and Tyler ok. Thanks man and get the header in the titanium finish it looks really nice.