Phil H 4 Posted November 22, 2021 Report Share Posted November 22, 2021 Appreciating this has been discussed many times ! but looking to replace the exhaust on my 6, the rear pipes and cross box are steel and now looking a bit sad. I intend to use SS and the traditional set up as existing, cross box twin pipes exit left. Question is why would you use a one pipe system into the box as opposed to 2 pipes? Phoenix appear to do both. Quote Link to post Share on other sites
Paul Hill Posted November 22, 2021 Report Share Posted November 22, 2021 Put a big bore on and hear that sound Quote Link to post Share on other sites
Mk2 Chopper Posted November 23, 2021 Report Share Posted November 23, 2021 10 hours ago, Phil H 4 said: Appreciating this has been discussed many times ! but looking to replace the exhaust on my 6, the rear pipes and cross box are steel and now looking a bit sad. I intend to use SS and the traditional set up as existing, cross box twin pipes exit left. Question is why would you use a one pipe system into the box as opposed to 2 pipes? Phoenix appear to do both. The single center pipe is the bigger bore version, if you just want to change to stainless then go for the twin center pipe version. Gareth Quote Link to post Share on other sites
astontr6 Posted November 23, 2021 Report Share Posted November 23, 2021 13 hours ago, Phil H 4 said: Appreciating this has been discussed many times ! but looking to replace the exhaust on my 6, the rear pipes and cross box are steel and now looking a bit sad. I intend to use SS and the traditional set up as existing, cross box twin pipes exit left. Question is why would you use a one pipe system into the box as opposed to 2 pipes? Phoenix appear to do both. The tuning Guru's of the past seem to favor the large bore single pipe system with one silencer out the back but that design does seem to cover the rear end with muck. Or they did promote the wheel barrow design with 2 pipes and 2 boxes out the rear end. To find out which system gives the most power it would have to be dyno tested? Somebody on this Forum may have done that? I have the standard system but in s/s with an SAH extractor manifold. It gives a good sound and is over 30 years old. Bruce. Quote Link to post Share on other sites
Phil H 4 Posted November 23, 2021 Author Report Share Posted November 23, 2021 If sticking with the standard system is it worth having the rear box made with the exit pipes extended a couple of inches To get the fumes away from the rear. Quote Link to post Share on other sites
paul83 Posted November 24, 2021 Report Share Posted November 24, 2021 Hi Phil, The general view is that the standard system of cross box, and twin pipes into it the box, is good for a standard engine and standard exhaust manifold. Standard steel or stainless steel give the same performance but the latter lasts longer (and is more shiny!). As Gareth said, the single system is a different (larger) bore than the twin system. Changing the exhaust to a larger bore without changing the manifold and engine performance (cam, pistons, ignition, tuning) will not give you any performance benefit. Conversely, the impact of improving the engine and manifold will be much reduced if you keep the standard exhaust. The list of things to do to the engine for noticeably increased performance is expensively long! I know that in the USA custom exhausts are much more common and much less expensive, and so people often choose an exhaust based on looks alone. Paul Quote Link to post Share on other sites
mhossack Posted November 24, 2021 Report Share Posted November 24, 2021 Hi can someone please recommend a standard S/S exhaust thank you. Quote Link to post Share on other sites
Kevo_6 Posted November 24, 2021 Report Share Posted November 24, 2021 22 minutes ago, mhossack said: Hi can someone please recommend a standard S/S exhaust thank you. Hi, I got mine from the TR Shop a few years ago and very happy with it. Quote Link to post Share on other sites
mhossack Posted November 24, 2021 Report Share Posted November 24, 2021 Cheers was it easy to fit, I am mainly thinking of clearance. Mick. Quote Link to post Share on other sites
Phil H 4 Posted November 24, 2021 Author Report Share Posted November 24, 2021 Thanks Paul, The plan wasn’t to improve performance so as the front sections are already stainless I’m going to just replace the rear pipes and the cross box. TR shop Chiswick have in stock and very helpful. Phil Quote Link to post Share on other sites
Kevo_6 Posted November 24, 2021 Report Share Posted November 24, 2021 12 hours ago, mhossack said: Cheers was it easy to fit, I am mainly thinking of clearance. Mick. Hi Mick, no problem at all. Really easy to fit. Quote Link to post Share on other sites
mhossack Posted November 25, 2021 Report Share Posted November 25, 2021 Thanks Kev. Mick. Quote Link to post Share on other sites
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