boosted_XR Member 364 Member For: 16y 4m 13d Posted 26/08/09 05:31 PM Share Posted 26/08/09 05:31 PM hey guys sorry if this has been covered b4 but I couldnt find exactly what I was looking 4.. anywayz im after an exhaust within the next couple weeks, just wondering if the xforce 4" dump 3.5" cat back would flow enough for 380-400rwkw, if not ill put the nizpro 4" on.. just wanna get pplz opinion's on the xforce exhaust, can they flow enough or better go the 4"? Thanks guys.. Link to comment Share on other sites More sharing options...
Muzza No V6 for me thanks!! Donating Members 583 Member For: 19y 3m 22d Location: Newcastle Posted 27/08/09 09:48 AM Share Posted 27/08/09 09:48 AM I think Xforce is doing a 4" system aswell. Xforse gear is 2nd to none & all Nizpro gear is well refined .. I you go the 4" you will be ready for the 500+ rwkw.Both with get you what.Muzza Link to comment Share on other sites More sharing options...
qik1 Silver Donating Members 2,720 Member For: 16y 6m 17d Gender: Male Location: Loitering in SEQ Posted 02/09/09 08:52 AM Share Posted 02/09/09 08:52 AM xforce only do a 4' to suite the fg's & wont be doin one according to a little birdy. The 3 1/2 system will easily flow 400kw. I'm not overly happy with the note that it gives at full noise but I had a custom rear section made up & now it flows great & sounds even better. Link to comment Share on other sites More sharing options...
Brandonn Donating Members 2,304 Member For: 16y 2m 13d Gender: Male Location: port hedland Posted 02/09/09 10:23 AM Share Posted 02/09/09 10:23 AM ive heard they have had troubles keeping boost lvls low... Link to comment Share on other sites More sharing options...
qik1 Silver Donating Members 2,720 Member For: 16y 6m 17d Gender: Male Location: Loitering in SEQ Posted 02/09/09 10:28 AM Share Posted 02/09/09 10:28 AM On the fg's it is. I dont know of anyone running a 4' system in a ba-bf without running big power so the problem never really came up I spose. Most of us went a hiflow cat on the factory system & when ya wanted over 330 & intended to push it hard you went the 3 1/2 or 4' so the issue of keeping boost down didnt come up. Could be wrong but that's my thought??? Link to comment Share on other sites More sharing options...
ebxmple Member 1,322 Member For: 16y 9m 28d Posted 02/09/09 11:19 AM Share Posted 02/09/09 11:19 AM (edited) Go the 4inch straight up. Its always going to flow enough,in case of "unplanned" future mods.Oh but get your wastegate done aswell at the same time. Edited 02/09/09 11:20 AM by ebxmple Link to comment Share on other sites More sharing options...
HIRO F6 Member 1,817 Member For: 15y 10m 8d Gender: Male Location: Brisbane, QLD Posted 02/09/09 10:45 PM Share Posted 02/09/09 10:45 PM Why is everyones preferred option an off the shelf system??? I went with a custom system, 3.5inch with 4inch split dump in stainless. Was $2,500, but it sounds and in my opinion performs better then any X Force system ive ever heard. Link to comment Share on other sites More sharing options...
boosted_XR Member 364 Member For: 16y 4m 13d Posted 03/09/09 06:16 AM Author Share Posted 03/09/09 06:16 AM thanks 4 the replies, most likely ill stick with the 3.5" system as I dont intend 2 go over the 400rwkw mark. the waste gate has been done so shouldnt have any boosting problems, also the rear section actually goes in2 twin 2.5" not sure if that makes any difference. thanks heaps Link to comment Share on other sites More sharing options...
Redback Banned 236 Member For: 15y 5m 16d Gender: Male Location: Blacktown NSW Posted 03/09/09 08:51 AM Share Posted 03/09/09 08:51 AM I've found that my XFORCE 3.5" System has found its limit at about 360-380rkw. Still not but for a chinese off the shelf system supporting about 600 flywheel HP in my opinion. It has saved me from squeezing more power out of the stock internals.lol. Link to comment Share on other sites More sharing options...
dalts Member 755 Member For: 18y 6m 2d Gender: Male Location: brisbane Posted 03/09/09 10:27 AM Share Posted 03/09/09 10:27 AM I run a 4" dump and custom 3.5 system,aslong as your run quality mufflers that will be fine!!cheers lee Link to comment Share on other sites More sharing options...
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