sm13f6 Member 34 Member For: 9y 11m 26d Posted 05/08/16 11:29 PM Share Posted 05/08/16 11:29 PM hey guys got a bf f6 , currently makes around 380kw iv got the xforce 4 dump and cat and so on with the twin 2.5'' catback system with the 2 mufflers im going back for retune and just wondering if I should upgrade to the single 3.5'' before hand as I think last time I had it tuned the tuner said the exhaust was restricting it abit anyone that can point me in the right direction that would be great cheers guys scott Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 4m 14d Gender: Male Location: Perth Posted 06/08/16 12:21 AM Share Posted 06/08/16 12:21 AM Twin 2.5 is similar to single 3.5. Twin 2.5 is good for over 400. But if you are cashed up go single 4 inch. Link to comment Share on other sites More sharing options...
sm13f6 Member 34 Member For: 9y 11m 26d Posted 06/08/16 02:49 AM Author Share Posted 06/08/16 02:49 AM ah ok that's cool just wasnt sure as tuner said it was holding it back , who makes a decent 4'' single ? Link to comment Share on other sites More sharing options...
camo86T Silver Donating Members 1,810 Member For: 11y 1m 1d Gender: Male Location: SW Sydney Posted 06/08/16 02:59 AM Share Posted 06/08/16 02:59 AM Xforce Nizpro SMB Listed from cheapest to dearest TOG also makes one, not sure of quality but some say similar to nizpro Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 9m 10d Gender: Male Location: Adelaide Posted 06/08/16 09:06 AM Share Posted 06/08/16 09:06 AM Even though cross sectional area is similar I find better performance out of big singles vs twin systems for big power goals Link to comment Share on other sites More sharing options...
camo86T Silver Donating Members 1,810 Member For: 11y 1m 1d Gender: Male Location: SW Sydney Posted 06/08/16 09:15 AM Share Posted 06/08/16 09:15 AM ^^ This guy knows Jet do u find big singles generally tend to drone more or not so? Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 9m 10d Gender: Male Location: Adelaide Posted 06/08/16 10:03 AM Share Posted 06/08/16 10:03 AM The only and I mean only exhaust that's ever droned on me in a XR6T was a 4* X-Force stainless system on a ute after we removed the central muffler and it was more obnoxious drony vs outright V8 Drone style so it was still ok lol Link to comment Share on other sites More sharing options...
Rab WOT? Moderating Team 10,981 Member For: 12y 15d Gender: Male Location: Frankston, 3199 Posted 06/08/16 01:01 PM Share Posted 06/08/16 01:01 PM (edited) 3 hours ago, JETURBO said: Even though cross sectional area is similar I find better performance out of big singles vs twin systems for big power goals Surface area of the 2 pipes is far greater than on a single (as far as the flowing gasses go) Far more exhaust gas is "rubbing" against the exhaust pipes in a twin system You get far more "blue" in a single system and far more "red" or "green" in a twin Edited 06/08/16 01:05 PM by Rab 3 Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 9m 10d Gender: Male Location: Adelaide Posted 06/08/16 10:31 PM Share Posted 06/08/16 10:31 PM 100% agree and good picture to go with it Link to comment Share on other sites More sharing options...
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