SPOOLAX Skids? Donating Members 975 Member For: 15y 8m 19d Gender: Male Location: Adelaide Posted 27/04/11 09:12 AM Share Posted 27/04/11 09:12 AM (edited) Hey guysLooking to upgrade my exhaust system to a Xforce 4inch Bell Mouth Style Dump-pipe with no cat into a Twin 2.5inch System Or 3.5inch System but not sure whats better?Thanks Edited 27/04/11 09:14 AM by SPOOLAX Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 2m 30d Gender: Male Location: Perth Posted 27/04/11 10:04 AM Share Posted 27/04/11 10:04 AM on paper the twin 2.5 flows more but due to the extra drag on the tube walls the 3.5 maybe better. Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 8m 9d Gender: Male Location: adelaide hills- 'race air' central Posted 27/04/11 11:35 AM Share Posted 27/04/11 11:35 AM 3.5 sounds better, but im happy with twin 2.5 for 360+ Link to comment Share on other sites More sharing options...
KWIK F6 Donating Members 526 Member For: 15y 10m 1d Gender: Male Location: Adelaide Posted 27/04/11 11:39 AM Share Posted 27/04/11 11:39 AM Hey mate I was speaking to Bruce about this the other week, he recommended 3.5" would be better...that's what im going for....Cant fault his advice so ill be following it Link to comment Share on other sites More sharing options...
xpl0sive Member 421 Member For: 16y 4d Gender: Male Location: Melbourne Posted 27/04/11 06:59 PM Share Posted 27/04/11 06:59 PM 3.5 xforce has a restrictive rear muffler I believe (less than 2.5"). Better off going for the twin 2.5. Link to comment Share on other sites More sharing options...
bradles024 Donating Members 1,145 Member For: 15y 2m 11d Gender: Male Posted 27/04/11 08:42 PM Share Posted 27/04/11 08:42 PM X-Force 4" Dump pipe isn't 4" the whole way either. Link to comment Share on other sites More sharing options...
SPOOLAX Skids? Donating Members 975 Member For: 15y 8m 19d Gender: Male Location: Adelaide Posted 28/04/11 12:44 AM Author Share Posted 28/04/11 12:44 AM Hmmm who has either systems on there car? Link to comment Share on other sites More sharing options...
CBXRT Banned 643 Member For: 14y 2m 3d Gender: Male Posted 28/04/11 02:40 AM Share Posted 28/04/11 02:40 AM (edited) Mate, this a touchy question - lots of different opinions. My opinion? Single 3.5 inch should flow better so its the choice for higher performance potential. Twin though sounds better and less hollow 'mooo-cow' than a single. It really depends on what you want from your exhaust system mate, and "one persons junk is another persons gold". Edited 28/04/11 02:53 AM by CBXRT Link to comment Share on other sites More sharing options...
SPOOLAX Skids? Donating Members 975 Member For: 15y 8m 19d Gender: Male Location: Adelaide Posted 28/04/11 03:43 AM Author Share Posted 28/04/11 03:43 AM I'm more leaning towards the 3.5 because I see that alot of 400+ cars are using them but do they have restrictive muffler like epl0sive said? Link to comment Share on other sites More sharing options...
bossmang FREAKY Donating Members 12,433 Member For: 15y 1m Gender: Male Location: Melbourne Posted 28/04/11 08:20 AM Share Posted 28/04/11 08:20 AM you arnt having a cat, so you got no restiction there, and get the rear muffler changed to a better flowing one if its bothering you. pretty sure xforce offer two types of muffler systems for the 4/3.5 inch. Link to comment Share on other sites More sharing options...
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