eBay Headers

[Hornung418]

I've dynoed eBay ones (from trader-nas) on my 85k miles 2004 ZHP Auto:
before - 217 hp 305 NM
after - 235 hp 345 NM

aFe in stock place, TSE 3 exhaust, no cats at all. No other mods for engine parts.

Not to piss on your parade, but I find that really hard to believe. Which dyno were you on and what was the correction factor?

The reason I doubt you is that one of the fastest N/A 330s only makes 237 at the wheels and has had a lot of engine work.

[TTI]

Not to piss on your parade, but I find that really hard to believe. Which dyno were you on and what was the correction factor?

The reason I doubt you is that one of the fastest N/A 330s only makes 237 at the wheels and has had a lot of engine work.

DynoJet
235 is bhp and not whp 15% drivetrain loss
I just wanted to show the difference before and after. No theory, just practice.

[Hornung418]

DynoJet
235 is bhp and not whp 15% drivetrain loss
I just wanted to show the difference before and after. No theory, just practice.

You should never base your numbers off of an imaginary drivetrain loss. That's just silly. There is no way you can know the exact percentage of power lost from the crank to the rear wheels. Please use your numbers for the wheels, when you do want to share your numbers, as that is actual real usable power and not imaginary numbers from a guesstimate percentage.

Just so we're clear, the stock horsepower from the factory at the crank is 235...if you're only making 217 there's the only pinhole I need to deflate your 'practice.' The ZHP has put down time and time again an anywhere from 200-209 rwhp and that's in the 6MT. without a torque converter.

In for the real numbers!

[Smolck]

I just installed these on a friends normal 330 and it gave a nice sound and a good "feel" of more power. I would think the ZHP would make a little bit more due to the cams being a little more aggressive and thereby allowing more exhaust flow when freed up? Sound plausible?

[Hornung418]

It won't make more power, but will have more whp due to the 10 hp difference between engines.

[UdubBadger]

pulling your cats won't make actual power without a tune. It allows you to TUNE for a touch more power but thats it. This isn't like a down pipe on a turbo'd car where you slap it on and get 20whp instantly.

[Hornung418]

pulling your cats won't make actual power without a tune. It allows you to TUNE for a touch more power but thats it. This isn't like a down pipe on a turbo'd car where you slap it on and get 20whp instantly.

Nah, you don't need a tune to take advantage of equal length headers. When you optimize flow of the exhaust, the DME will adapt to the change in exhaust velocity...But, you can utilize a tune to make more power over the Stock DME w/ headers.

[UdubBadger]

you won't actually MAKE power though, you'll just get more efficient acceleration. with the headers, you will be able to tune a car a touch more aggressively than you could with the stock ones and a tune which will make a touch more power than just the tune. However, headers alone won't make any power on a dyno without proper tuning for them.

[Hornung418]

you won't actually MAKE power though, you'll just get more efficient acceleration. with the headers, you will be able to tune a car a touch more aggressively than you could with the stock ones and a tune which will make a touch more power than just the tune. However, headers alone won't make any power on a dyno without proper tuning for them.

Give it 200 miles for the DME to adapt and you will find that you've gained 15-20 horsepower without doing a thing. This is a proven gain on the M5x series motors. You can find countless threads on e46fanatics.

There is a MAJOR difference between the stock exhaust collectors and the ebay reps:

[danewilson77]

So you will actually gain HP.

HTC Thunderbolt+TT