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Old 08-20-2001, 01:57   #1 (permalink)
Australian XR8 Member
 
Join Date: Jul 2001
Location: Wellington, NZ
Posts: 170
Herrod headers/exhaust

The nicer than nice 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 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 dyno
2.How can one 2 1/2 " pipe be better than 2 x 2 1/4 (or whatever standard is). Wouldn't standard pipes with freer flowing mufflers flow more?
3.One for the little piggy - do they have ADR or similar compliance (to combat that 'excessive noise' ticket).
4.Where to from here? Does anyone have a list of parts including prices vs performance increase to make the 200kw something more realistic (good chassis in car, shame about the power:( )
5.Any other good comments about such a system would be welcomed.
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Old 08-22-2001, 05:45   #2 (permalink)
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Join Date: Jul 2001
Location: australia
Posts: 399
Re: Herrod headers/exhaust

Quote:
Originally posted by AUII XR8
The nicer than nice 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 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 dyno
2.How can one 2 1/2 " pipe be better than 2 x 2 1/4 (or whatever standard is). Wouldn't standard pipes with freer flowing mufflers flow more?
3.One for the little piggy - do they have ADR or similar compliance (to combat that 'excessive noise' ticket).
4.Where to from here? Does anyone have a list of parts including prices vs performance increase to make the 200kw something more realistic (good chassis in car, shame about the power:( )
5.Any other good comments about such a system would be welcomed.
we would be happy to send you a chassis dyno report on the xr8 manuel or auto.we pick anywere from 10 to 15 kw at rear wheels on the average.all our systems meet ADR requirements /but you lucky people in NZ you dont have to run cats we have a cat replacment pipe that bolts straight in.We under no cicumstanses sell these in australia
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Old 08-24-2001, 23:22   #3 (permalink)
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Well I must commend you Herrod Motorsport for making such a fine product. Looks great under the bonnet and sounds great too. Even had a guy in a common***** opps Commerdoor (off an old Commer van) give me the thumbs up on the motorway the other day. Great tone - must have taken ages to make it sound that good! Have heard may after market systems, but none this good. No drone, etc. Would rec this system to all!! Forget the rest!
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Old 08-25-2001, 04:15   #4 (permalink)
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Quote:
Originally posted by AUII XR8
Well I must commend you Herrod Motorsport for making such a fine product. Looks great under the bonnet and sounds great too. Even had a guy in a common***** opps Commerdoor (off an old Commer van) give me the thumbs up on the motorway the other day. Great tone - must have taken ages to make it sound that good! Have heard may after market systems, but none this good. No drone, etc. Would rec this system to all!! Forget the rest!

Whats exactly sis u get done and if you dont mind what sort of $$$ did u pay. Im interested in getting the herrod setup on my au xr8
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Old 08-25-2001, 23:01   #5 (permalink)
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Herrod HPC headers which in my case go 4 into 2 about where original ones go 4 into 1, then the 2 pipes carry on until where the rear of the cats normally are. (don't need cats here - hell the Green party turned up to parliament on their first day in a smoking polluting old Lada!). The 2 pipes the reduce to 1 at the flange. Oh and each of the primary tubes are equal in length. ie the number 4 tube comes foward, then returns toward the firewall.

The exhaust itself - similar to the old EF pipes. 2 x 2 1/2" pipes back to a y junction, then one pipe into a freeflow muffler, out to the second muffler tucked away behind the right rear bumper, then finished off with an oval tip similar to VT/VX tip, except bigger - fills in the indent in the rear bumper nicely thank you very much! Of course these exhaust bits are all stainless items from front to back.

Cost? Well you get what you pay for. Before you decide on anything else, please do yourself a big favour and ring Herrods and ask them for a price. I drove over 600km return to get mine done. Worth every km of enjoyable driving. Had to have the car up on a hoist at the local Ford dealership for the trans problem and the mechanics there admired the workmanship. Top class finish!

Sound? Awesome. Turns heads around town. The Holden boys look. Nice throaty noise. A little cackle. Decelleration in low gear (engine braking) sounds great too! Certainly a lot more torque lower down. And absolutely no drone - these guys spent some time on this system!
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