discostig Manual mode ________________________ All day, erryday Donating Members 13,798 Member For: 17y 3m 2d Gender: Male Location: Probably above atmospheric pressure Posted 30/01/12 02:59 PM Share Posted 30/01/12 02:59 PM (edited) Twin 2.5 is enough for 11's and low 300rwkw, I run the Manta version (two cats) in mild steel. I have been told the Manta twin 3" is less prone to drone, but mine only gets to me if towing at 100km/h though or if in high gears up hills for extended periods. I very much enjoy the sound of it at light throttle 1500RPM cruising or when puttering around at carpark speed too, sounds good when up it a bit too, not sure on how it compares at WOT as I'm too busy pointing the car in the right direction. Need to have someone film me...Advantage of less restrictive exhaust would be lower boost for given power, plenum helps here too though I believe. I run 15PSI from 3k rpm to 6. That's down to the tune though of course.Have heard xforce flow "ok" but can be difficult to fit straight, but man they are cheaper! Worth looking at.Don't bother getting only cat back if you want power mods, always get full zorst and get it tuned. Add cooler to that and injectors/pump Edited 30/01/12 03:13 PM by -SteveR- Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 3m 30d Gender: Male Location: Perth Posted 30/01/12 03:12 PM Share Posted 30/01/12 03:12 PM (edited) Twin 2.5 will make a lot more than low 300s. I made 340 with an average twin 2.5. I would say a good one would go close to high 300,s 380 - 400. Manta twin 3 inch is overkill unless you are going over 400 rwkw and I heard are difficult to fit. Maybe the OP only wants a bit of noise. Cant beat the redback. then maybe throw in a cat later. Edited 30/01/12 03:14 PM by arronm Link to comment Share on other sites More sharing options...
tim182 Donating Members 31 Member For: 13y 5m 20d Gender: Male Posted 31/01/12 07:22 AM Author Share Posted 31/01/12 07:22 AM I have found a twin 2 1/2 inch xforce cat back exhaust on ebay and just wondering if anyone knows how this sounds. I would of gone the xforce 4" dump into single 3.5 but is a bit pricey for me so if any one knows of something good I can get for $1500 would help Link to comment Share on other sites More sharing options...
Boogtonic Member 76 Member For: 13y 5m 1d Gender: Male Location: Brisbane Posted 31/01/12 08:27 AM Share Posted 31/01/12 08:27 AM I have found a twin 2 1/2 inch xforce cat back exhaust on ebay and just wondering if anyone knows how this sounds. I would of gone the xforce 4" dump into single 3.5 but is a bit pricey for me so if any one knows of something good I can get for $1500 would help Rapid systems sells mild steel xforce full systems for less than $1500 bro Link to comment Share on other sites More sharing options...
tim182 Donating Members 31 Member For: 13y 5m 20d Gender: Male Posted 31/01/12 08:40 AM Author Share Posted 31/01/12 08:40 AM cheers man ill check it out Link to comment Share on other sites More sharing options...
tim182 Donating Members 31 Member For: 13y 5m 20d Gender: Male Posted 31/01/12 09:57 AM Author Share Posted 31/01/12 09:57 AM ok ive checkout the xforce systems on rapid systems and im happy with the price next question twins or single? Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 3m 30d Gender: Male Location: Perth Posted 31/01/12 10:37 AM Share Posted 31/01/12 10:37 AM how much power are you looking for Link to comment Share on other sites More sharing options...
tim182 Donating Members 31 Member For: 13y 5m 20d Gender: Male Posted 31/01/12 11:05 AM Author Share Posted 31/01/12 11:05 AM a few kw would be nice. not entirely sure how much they add Link to comment Share on other sites More sharing options...
Ciaran Thooperrrrrrr Donating Members 2,768 Member For: 13y 7m 24d Gender: Male Location: NOR, Western Australia Posted 31/01/12 11:48 AM Share Posted 31/01/12 11:48 AM I think he means how much are you looking at in general from the car? 300/350/400kw etc as that will determine which setup you should go for 1 Link to comment Share on other sites More sharing options...
Boogtonic Member 76 Member For: 13y 5m 1d Gender: Male Location: Brisbane Posted 31/01/12 11:56 AM Share Posted 31/01/12 11:56 AM (edited) ok ive checkout the xforce systems on rapid systems and im happy with the price next question twins or single?Quiet or loud? If you're after quiet no matter what power the 3.5" single might be too much for you....but tuners generally say it flows better than the twin 2.5" so that's the one to go for performance wise..best give your local tuner a call, after all they will be the one working with it and may have the right answers (not to undermine anyone's answers here, but I wished I'd listened to Lee the first time around) Edited 31/01/12 11:59 AM by Boogtonic Link to comment Share on other sites More sharing options...
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