Herrod Motorsport Headers/Big Bore
Can you describe the complete Herrod Header / big bore arrangement for an XR8 AUII. System I anm thinking of- take off twin system, Y junction and single pipe with 2? mufflers. Add VX style oval tail pipe.
Has there been a proper dyno test on the system. Standard is 200kw (stated, and hopefully not the same as a 4.6L Ford Mustang recall power figure- we all know about this!).
I'd really like to know
1.What is the increase in power tested on calibrated dyno.
2. Economy - better or worse (who cares really, but good to know)
3. Noise factor - is it noisey, does it drone (headache after 4 - 10 hours driving).
Many thanks for any input.