I'm catless header and front pipe. No smell...

I have this setup minus borla. But do have the rev works. Yes, very LOUD, very raspy.

is that with E85? Those are nice gains, and fixed dip.

Based on Simmons build thread, I'm apt to take his word... wait... he has a dyno, sponsors, and lots of posted runs. That's data + reputation + experience backing that a header can increase performance?

My question would be, the dyno is after many mods and lots of weight loss. How do you extrapolate the gains from the header vs the weight/etc.

I'm going to make the assumption that most people have a different opinion on what they think of as "rasp" or the catless smell.


Catless will have an odor but depending on how rich or lean the tune will determine how much.

Turbo catless will always smell ( 11:1 is a lot of fuel)

+20whp and +20wtq is UFB for just a header. What else changed? New tune? header-back?

where there be any UEL headers with a cat intact so i can still pass ny emissions? lol

Stock FRS,......that's absolutely hilarious :bellyroll: I guess you don't know my car very well,...performance wise there maybe one or two in the country that have as much strictly performance power mods on the FRS/BRZ platform than I do, ,.... Crawford or Accelerated Performance may have more into there cars,..maybe,..there will be others as time passes and I may have missed a few ..but I do believe I went forged with an engine build before both of them... that's about it as far as I know making the power I am and the supporting mods to back it up ,I even just went to Dons fuel system converting returnless to a return FI system with pressure regulater and which is necessary at 22 psi of boost...don't think he even advertises this kit yet......I'm also the test bunny for Full Blowns billet fuel rails,...only one in the country running them.....but my OEM headers are stock and catless....go ahead and waste your money,....that's what capitalism is all about. My local shop dynode a Frs and his pulls were way below the 15 other stock FRS's dynod,.... they thought something was wrong with his car so we put all my OEM stuff on his car as he bought into the hype and then got rid of everything except the stock headers,.... first to go back to the dealer to see what was wrong with it as they wouldn't touch it not stock (warrantee work),....second to see what his pull would be stock at the shop,....well folks he gained back both WHP and torque he lost going with a well named brand header and catback that I see a lot of guys on this forum running,...he is now in the top tier of the stock FRS's tested ,...the header and pipe will remain nameless, but I assure you its a well known brand.....I have 30k in my build all performance orientative, no fluff or exterior show and no go parts,.... You all seem to want to go to pipes just for a sound,... not carrying what numbers you end up with, don't fall for the overinflated hp gains/shop claims... Hard to be a troll with 241 posts and 167 thanks,....you don't seem to observant about things. I may eventually go aftermarket on the headers, but not right now,....there's to many shops blowing smoke about them with false numbers to get on the after market frenzy this car created , I could give a crap about what they sound like. Just give me the truth on the gains,....I don't think its there yet,...but hell go ahead sound loud,...look fast....and have SUV's Camry's and Pickup trucks blow you away at stoplights.

So you are saying that the stock headers are as good as anything? Or any exhaust modification would be JUST for sound?
mate, with all due respect but if that were to be the truth...than you either know something WE don't know or the other way around.
I will ask you few questions:
1. Why all (or at least majority of them) the existent headers improve the flow of the factory header. There is no need to explain that better flow equals more power.
2. If all the headers are snake oil/or dont give you that much power WHY even independent dyno show a considerable increase in power especially when a tune is added into equation? Why all these tuners are still in the market/business, i mean heck...a high flow header is not a bloody electric fan you stick into your exhaust and expect super power!!!!
3. Why all racing cars change their factory headers to a high flow one? I dont think they would do it for sound, or a limited amount of power.

Sorry, but to state that a header does not give you any power or very limited is just plain silly. Have a look at the bloody overpipe and how restricted it is. Changing that will give you some power...not 50hp, but damn, 2-3 maybe. All these modifications together will give you the right amount of power, add a tune and you're in the business. Well, not as much as forced induction but hell, enough to keep some people happy.

Your making my point,....it will add power,.... my point is not enough R n D has been done yet to make it worth ones while yet....that's all.The racing teams have proven platforms that have been around for years, or have deep pockets to do the research,.....this is an economy sports car at heart, it aint going to happen overnight. Its only been around for a year . And whats been rushed to market isn't very impressive, if not worse than OEM.

There's not much more people can do with a header for what has been released. You have to realize there's only so much you can do with limited space and matching the design of the exhaust. Headers 2 years from now won't be blowing away anything there is now. I'll be interested to see how much the collector plays a factor into the different UEL's.

I'll agree with your point with internal components though. We don't even know the limitation on this engine with boost. That is where the R&D will be necessary to find out highest gains. I think the injectors and the pump are something to also keep an eye on with turbo charging down the road. This is the reason why I'm going to wait on FI and see how these kits perform a year or two down the road for people who currently have them.

I didn't notice the weight loss, but I can sleep better knowing it weighs less.

I had header back exhaust from the beginning, then the tune. I noticed the tune but not the exhaust.

The header made a big difference, especially by getting rid of the dip. It seems no matter where I drive, I will be around 3,500 rpm and I don't mind it anymore without the dip. It pulls strong right to 8,000. I will have to make a in car video to show you.

I am on pump gas right now, and it still pulls strong.

Simmons

Here's another independent dyno... my own car. Borla UEL header, stock tune.

http://i374.photobucket.com/albums/o...psc97ec664.jpg

This has turned out pretty good for being trolled early on :-)

Entire Exhaust Considerations:
0. Weight Saving (little to none?)
1. UEL Vs EL
2. Cat Vs. Cat Delete, complicated because there are two cats here and you could delete one or either.... so really,
2. Full Cat Vs. Front Cat Vs. Rear Cat Vs. Cat Delete
3. Straight Vs Dual Exit Exhaust (not sure here)
4. Don't forget wide band sensor. (and placement)
5. Brand / Research
6. 2.5" Vs. 3" (NA Vs. FI)
6. FI or not. This is bigger than gets discussed I think, leading to the type of confusion going on here. I'm under the impression now that a new header isn't necessarily going to mean gains in torque or hp. What it can mean is:
6A. Keeping things properly cooled in a FI setup.
6B. Allowing proper through-put in an FI setup.
6C. Extending life of engine.
7. ECU Considerations; will you leave it alone or
7A. Piggy Back Vs. Replace Vs. Flash

Which would mean choosing a header based on your goal; and having to consider a lot of variables. Sounds easy to end up with no gains or even a loss as mentioned.

Is there other stuff going on here that I probably wouldn't know as a noob?