100-200 km/h results between gutted OEM DP & aftermarket DP

[His4]

Hey guys,

Many of you drive with gutted OEM Downpipes.
I often read that there should be no difference in performance, between gutted & aftermarket Downpipes.

Thats why i did some test runs (100-200 km/h) first with aftermarket DP and after with OEM gutted DP.

Car is:
M6 F13 - HCP Stage 2+ - K&N drop in - NGK @0.020"

Heres the results:

[M3EATERS]

What OEM catless DP's were you testing please?

[His4]

Originally Posted by M3EATERS

What OEM catless DP's were you testing please?

I tested it on my own car and same dragy slopes

[M3EATERS]

Brand please?

[YanoM5]

Good stuff

[His4]

Originally Posted by M3EATERS

Brand please?

The gutted was the Original BMW Downpipes.

The Aftermarket has not brand.

[mister2d]

What was your motivation for testing a gutted OEM cat vs. an aftermarket catless downpipe?

[Pikey Motorsports]

Wow that’s a huge difference

And both are the same tune?

Which RON tune is this

[His4]

Originally Posted by mister2d

What was your motivation for testing a gutted OEM cat vs. an aftermarket catless downpipe?

For less thermic / heat & less rattle noise, because duble walled.

but the performance becames less too

[His4]

Originally Posted by Pikey Motorsports

Wow that’s a huge difference

And both are the same tune?

Which RON tune is this

Yes, it was the same car.
Same condition with ambiente temperatures and same measuring street.

Run a 102 Octan tune.

[Mr. M6]

good to know that, thanks

[His4]

Originally Posted by Mr. M6

good to know that, thanks

Your welcome 😊👍

[Dwaynos]

Could someone give us stock cat vs gutted on a stock tune times?

[technician117]

Cool thread. Thanks for posting!

I second the above question... Would be cool to see stock cats versus gutted cats.

[His4]

Originally Posted by technician117

Cool thread. Thanks for posting!

I second the above question... Would be cool to see stock cats versus gutted cats.

I have done some stock times with original cats.

About 7,6 sec.

I can flash today my car to stock tune and do some 100-200 runs with the installed Original decats.

[IMG]https://s16.directupload.net/images/190406/n4zrubex.png[/IMG]

[Pikey Motorsports]

Originally Posted by His4

Yes, it was the same car.
Same condition with ambiente temperatures and same measuring street.

Run a 102 Octan tune.

Thanks what is your best time on this tune

[His4]

Originally Posted by Pikey Motorsports

Thanks what is your best time on this tune

5,72 sec. with qstarz on dry road.

Now i ordered the dragy to correct the time. but right now we have a rainy weather. 6.0 sec. was on wet street with dragy.


Maybe these day will be dry and i can try some new measurements and correct the times.

[IMG]https://s16.directupload.net/images/190406/zwq3r6wj.jpg[/IMG]

[Pikey Motorsports]

Nice I have this tune now it’s very fast

[His4]

Originally Posted by Pikey Motorsports

Nice I have this tune now it's very fast

Do you done some measurements 100-200 ?

[Pikey Motorsports]

Originally Posted by His4

Do you done some measurements 100-200 ?

So far 5.6 2nd gear start

I think I can beat this with 3rd gear start! Not so many gearshifts

[His4]

Originally Posted by Pikey Motorsports

So far 5.6 2nd gear start

I think I can beat this with 3rd gear start! Not so many gearshifts

Wow. Nice 👍
Try in 3rd. Its way better than sart from 2nd.

[lporschef10m5]

Originally Posted by His4

Yes, it was the same car.
Same condition with ambiente temperatures and same measuring street.

Run a 102 Octan tune.

Do you have number for just the OEM dp not gutted
..kinda curious versus the one gutted one if it's the same
Thanks