what makes you so sure?

I would not even bet $1 on that statement

the stock manifolds may look ugly, but they happen to work quite well with the stock cams and even the most popular mild cam upgrades.

Proper headers on these cars do work quite well - but the el cheapo ones produce mediocre results, at best

 

The 100$ headers are copys of the better ones and they are larger in diameter than the stock manifolds.

 

which means nothing in terms of the power they produce ^

the cheap ones are copies of headers which are, at best mediocre and as such, produce very lackluster results

the worthwhile headers for these cars have not been copied and are far more expensive

 

Like the crawford or nismo ones? Those are the only high dollar ones i see avalible. Ill still go by my thinking of larger primary tubes produce more power, wich is true. So basically your saying strup or dc sports headers are no good and produce no power because thats who the chinese copied. Hell they were probably made in the same factory.

 

It's not the diameter of the runners so much as their length and the collector design.

 

the NISMO ones are expensive......

that's about all I'll say about em. For half the cost you could get a DC Sport and get the same gains (not much). Do they make some power, yes. Do they make anything worthwhile...with stock cams or the typical cams people do, nope...not for my $ at least.

You can think what you want, and everyone is entitled to the opinion. The mere fact that a header has a larger primary, on an NA car, means absolutely zilch.

What miamimax posted is absolutely spot on. The idea is to get the gasses out of the head quickly. The mere fact that you now have a larger primary does not mean you've actually improved anything

 

well, i can change my headers in less than an hour, i will dyno any that people send me and publish the results on here.

 

Didn't Xerd or somebody with a name like that make long time headers a long time ago?

 

Hmm then theres only Crawford and 350EVO but I don't know if either of them is in business either. Heres a pic of the 350Evo headers from long ago...

 

I put TS headers on and the average net result was JACK.

It did put a squiggle on the curve. down, up, down, up... But the net was zilch.

+1 on the design requirements. Headers are about tuning. Not just simple pressure drop.

Jeremy, you can have my TS headers. Maybe they will do something different for your engine.

 

Actually, headers do very little in an NA application or atleast a lightly modded NA application. I had some Nismos (actually, I still have them in the garage) and it did very little, if ANYTHING to increase the performance of the car.

Even though they may have bigger diameter tubing, it doesn't make much difference when the size of the whole in the side of the block is still the same.

When I put my turbo on, it was recommnded that the stock manifolds go back on becasue due to their smaller diameter, it will help increase the velocity of the exhaust to the turbo housing.

Overall, headers are a complete waste of time especially if you have a stock engine.

Aftermarket Z headers FTMFL!

 

Dsport did a dyno comparison. They added Y-pipe-back exhaust from Apexi and a Popcharger, it was dynoing 253 hp, 238 tq. then they added strup headers and test pipes and netted 10 horespower and 9 pound feet of torque. and those Strup headers cost half what your Nismos cost .

 

That test seemed quite a bit off when I read it. The gains from the Pop charger alone were RIDICULOUS. The headers amy give you some power but most of it is going to come from ditching the cats not the headers. The install is WAY too much time on a stock car for the gains you get. For audible's car its a different story though...

 

if anyone wants to send me headers, i will throw them on for sure and post results. i think there is a lot more potential to unleash in my motor, my heads are ported but doesnt matter if flowing into the restrictive stock headers.


here is what happened at the track tonight..

got a couple passes in tonight, will post up the video and slips, wont be too long till i hit 11s.

i had three runs, all trapping 111, 12.3 12.3 and a spinning 12.6 i am only picking up 21-21.5 in the top so i have some weird issue going on in some rpm in 4th gear, i will figure it out.


90 1/8th trap is nice though!!


ill put up my time slips tomorrow.

 

yeah they said it was because it had 30k miles on the stock air filter. If it was a fresh factory filter the popcharger wouldve only netted 6-8 peak hp they guessed.

 

Yeah, I read that article too.

BTW, test pipes alone can do that when hooked up to a good exhaust. So its not necessarily attributable to just the headers.

Headers can work but they MUST be hooked up to test pipes and a good exhaust.

If stock cats or y-pipe are used, its a waste of time.

 

Can you send me your new addy again?

 

... On a race car? I must disagree...

 

my shop address is

Performance Factory
9773 Orange Blossom Trail Suite 29
Orlando FL 32837

thanks for all the support everyone, cant wait till Brian Crower grinds me my cams here soon.

 

first run i ran too much air in the tires to see if they would still hook and they didnt even with a good burnout, next two i dropped it down to 15 psi. 1.700 60 foot!!!! cant wait till get my cams and headers on.





ALL MOTOR!!! hehehe