We custom made these headers for our customers XJR, and they turned out great. The cars tune was not touched, all we did was bolt them on, strapped the car back down to the dyno, and released the hounds

 

impressive

 

OK, so will they be available with O2 sensor bosses, and have you a price?

Finally for us EU guys - will you be fitting the cats and showing the dyno levels, as running without cats is not an option.

Thanks!

 

Deleting cats is good for about 10 hp, so 30 rwhp for the headers alone is still very good.

Note to BIP: you can rev these car to 6200 rpm; looks like you only ran it to 5700.

You might pick up a few more horses, unless the overdriven Eaton or intake is choking off power at the top end.