Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
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Hi,
Im going to buy a cat-back for my on going road rally/enduro car. Can anyone tell me which exhaust would be most sensible and which would have the best performance values out of the following...
This one has two silencers and a 2" bore...
http://www.rallydesign.co.uk/catalog/product_info.php?cPath=1385_1401_1413&products_id=11067
This has a single silencer and a 2 1/4" bore...
http://www.rallydesign.co.uk/catalog/product_info.php?cPath=1385_1401_1413&products_id=11071
Also, the standard system is 2" and I was told the 2 1/4" system would mate with the standard system, can anyone confirm this? Would it just slip over and fit with some sort of clamp? I also hope to team the cat back with a decat at some stage which come in either a 2" or 2 1/4" bore and a 4-2-1 which I assume is 2".
Thanks. 
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abdus
Member
Registered: 23rd Feb 06
User status: Offline
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http://www.rallydesign.co.uk/catalog/product_info.php?cPath=1385_1401_1413&products_id=11071
http://www.rallydesign.co.uk/catalog/product_info.php?cPath=1385_1401_1413&products_id=11067
the links you posted cannot be loaded
[Edited on 06-10-2006 by abdus]
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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the 2.25" system will have a reducer built into it, much like the BFO system here -
so it fits to a standard 2" system.
the 2.25" system for your Rallye might be different though, especially as they offer 2 different de-cats.
personally, i'd go for the 2" system, especially on an engine running the standard injection system.
ring rallydesign and see if the 2.25" one fits with a standard cat etc, then ask the guys on the rallyeregister if a 2.25" system is better
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Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
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I think you can get two different size decats anyway. The 2 1/4" system has a black tail aswell and on one site it claims these are purposely built for motorsport but when I rang up some chav company this woman was telling me ashley systems are only built for noise 
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Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
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Anyone?
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Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
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help
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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Ashley systems are not built for noise
i had an ashley competition system on my nova, it wasnt loud.
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Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
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its the singleboxness im worried about, under 98db would you say?
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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get a twin box. I have never seen a quiet single box system, plus they are usually raspy
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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i had no centre box on my corsa, it wasnt any louder, it was just raspy as fuck.
twin box ashley systems are great. the competition ones have silencer skids too 
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Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
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skids? think il go for the twin box
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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yeah, little metal things on them, at the bottom at an angle, so you cant catch the box on a rock 
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Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
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Well I ordered the twin box, was worried about the sound levels. Can always make a decat pay pass in time. Was cheaper than the other one also.
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