fgxr6t89 Member 16 Member For: 11y 7m 21d Gender: Male Location: Melbourne, South East. Posted 05/03/13 01:45 PM Share Posted 05/03/13 01:45 PM Hi,I have a fg xr6 turbo. Looking at getting an x-force cat back exhaust.deciding between a twin 2.5" cat back or single 3.5" cat back.hoping someone can help me with a few questions:1. Does anyone know which exhaust is louder; twin 2.5" cat back or single 3.5" cat back.2. Will a re-tune be required.3. Which exhaust will make more power? 1 Link to comment Share on other sites More sharing options...
Kosij Donating Members 2,045 Member For: 12y 8m 12d Gender: Male Posted 05/03/13 03:13 PM Share Posted 05/03/13 03:13 PM I have had both systems on my ba!The twin 2.5 was soft and I removed the middle muffler to make it louder! Supported 320rwkw Went to 3.5" sounds nice as is and is good for my 385rwkw.Catback systems are fine but if you touch the cat you will need a tune.3.5" is the better one to go for if chasing power.... 2 Link to comment Share on other sites More sharing options...
Kroozin Menace Donating Members 1,990 Member For: 13y 1d Gender: Male Location: Sydney Posted 05/03/13 11:08 PM Share Posted 05/03/13 11:08 PM I wish I went a 4" instead of twin 2.5's Link to comment Share on other sites More sharing options...
Impellor Member 835 Member For: 13y 9m 3d Gender: Not Telling Posted 05/03/13 11:49 PM Share Posted 05/03/13 11:49 PM 3.5 inch is a clear winner. Also for some reason turbo cars respond better with a single system. Veloscity I suspect. Cheers Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 15y 10m 23d Gender: Male Location: Adelaide Posted 06/03/13 12:16 AM Share Posted 06/03/13 12:16 AM Cummon wiki u got better than that 2 Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 15y 11m 7d Gender: Male Location: adelaide hills- 'race air' central Posted 06/03/13 03:38 AM Share Posted 06/03/13 03:38 AM my twin 2.5 mild system is supporting 365rwkw... 3 Link to comment Share on other sites More sharing options...
Trent0 The Toxic Rocket Donating Members 574 Member For: 13y 11m 29d Gender: Male Location: Brisbane Posted 06/03/13 04:08 AM Share Posted 06/03/13 04:08 AM Get a custom 4" or gtfo 2 Link to comment Share on other sites More sharing options...
Paulie2256 Donating Members 7,441 Member For: 15y 5m 1d Gender: Male Location: SE Melbourne Posted 06/03/13 04:48 AM Share Posted 06/03/13 04:48 AM twin 4" Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 15y 10m 23d Gender: Male Location: Adelaide Posted 06/03/13 05:46 AM Share Posted 06/03/13 05:46 AM Twin 5" Link to comment Share on other sites More sharing options...
rednose RNS10S Donating Members 2,229 Member For: 17y 8m 7d Gender: Male Posted 06/03/13 06:18 AM Share Posted 06/03/13 06:18 AM I have had both systems on my ba!The twin 2.5 was soft and I removed the middle muffler to make it louder! Supported 320rwkwWent to 3.5" sounds nice as is and is good for my 385rwkw.Catback systems are fine but if you touch the cat you will need a tune.3.5" is the better one to go for if chasing power....There are guys running twin 2.5 inch x-force systems that have over 450 rwkws. Link to comment Share on other sites More sharing options...
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