[AceHeader-MT]

Originally Posted by bur****jp

You mean integrals.

haha, good catch

Originally Posted by DarkSunrise

Looks like the "USA EL long runner" header makes the most power from 4500-7400 RPM. Would probably be my choice for a track-only car. But gives up a lot of torque under 4500 RPM.

For a daily driver or DD/track mix, the "4-2-1 full 02" seems to be a good compromise.

Yes, for our track car Delicious has given us a specific tune for our set-up which produces smoother torque curves and more power.

For the DD and HPDE drivers this may not happen.

Originally Posted by churchx

AceHeader-MT: i meant - low gains shown not due dyno (that's very common problem with trying to compare results from different dynos and going just for numbers, not +%), but low gains shown relative on baseline oem stock. Of course, some dynos may show much higher relative to others, but if baseline is done on same dyno and at similar weather (air temp/pressure wise), then relative % gains should be same no matter what dyno is used for both baseline & with header+tune.
And i don't get - why. Maybe baseline is too high for some reason (mixed up with chart from different configuration? Or not stock, but with tune?), maybe something wrong with aftermarked parts installed runs (wrong or no tune? bad install with leaking gaskets?). I fail to see why there is just 172.4 whp stock 176.4 4-2-1(+FP) (+2.3%), 200.3 Nm stock 202.8 4-2-1(+FP) (+1.2%), when for example with custom tunes Nameless or PTuning headers can get from 175 whp baseline to 200 header+tune (+14%).
It's not +5whp vs +25whp, that might be due different dynos, that seems wrong to me. It's +2.3 vs +14% that seems wrong.
And i have no clue for reasons, as i see nothing wrong with how header is designed, it even seems more promising design wise to me then other headers with sharper bends, shorter runner lengths, with collectors of runners at wider angle. Magic
IIRC, even just and only off-the-shelf tune on full-oem-stock can give at least +10whp/+5% on petrol, twice what your header+tune shown. I just don't get what might be wrong. Tune + catted header should give +15whp. Your uncutted one SHOULD be much better :/
LOL, usually some unbelieving customers distrust vendor supplied results being too high .. now it's other way around, with me trying to distrust too low ones

I agree, and we were slightly dis-heartened by the figures, I can tell you most cars with these upgrades (header+tune from anywhere) should produce close to 200hp and higher torque figures...

Originally Posted by Teseo

The combo #4 looks promising, nice work and thanks for the effort.
Where is the sounds clips lol

Thanks, we took some video but with the rolling road sound and massive blower to keep the car cool it was tough to get exhaust sound.

You can check out on-board sounds from the GT car here. Only difference is we have a custom muffler, different from the OE one used for dyno testing: [ame="https://www.youtube.com/watch?v=o5f-fCfZExI"]2015 TSF rd.1 - YouTube[/ame]

We can work on getting good sounds bites next

Originally Posted by Calum

The 4-2-1 OEFP looks great to me. Less money and it gains significantly down low while only giving up about 5 hp in the mid upper range.