Delkevik or Black Widow headers and 4 into 2 collector box

[cr500]

I like my nice open mufflers on each side of my 2004 model but starting to look into more performance mods.
Any ideas on whether the Delkevik or Black Widow down pipes and collector boxes improve HP much over standard when paired  with existing high flow mufflers?

[seth]

If you want to maximise the power of your bike you need a full system
Either a yoshimura full system or an akroprovic full system then your looking around 120(rear wheel) bhp that depends on the dyno, the operator of the dyno and the weather in the day.
Other than that you need a set of yoshi cams (or regrind cams ) to get up around 135bhp at the wheel again depending on the same conditions as above .
As I said on the other thread it's all here to read if you do a search that's the point of the org and why it's not Facebook

Good luck 

[Grmpf]

See also:

https://gsx1400owners.org/forum/index.php?topic=5726.0
and
https://gsx1400owners.org/forum/index.php?topic=4746.0