exhaust help plz
12 October 2008, 03:38 PM
#1
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exhaust help plz
right im thinking of decatin my wrx,problem is not sure if theres all sorts of different size decat pipes for all various makes of exhaust or are they all the same size ive got a blitz nur spec,sorry to sound thick but would like someone to put my mind at rest.
also how many cats are on my car its a jdm 95,and does anyone know where i can buy the whole system from
.
cheers dan.
also how many cats are on my car its a jdm 95,and does anyone know where i can buy the whole system from
.cheers dan.
12 October 2008, 05:27 PM
#4
Best to get a 3'' bore T304 grade stainless steel one (most are). Then in order from bad to best...
Bad... Outlet port for turbine only, with wastegate area blanked off (as per OEM cat d/p). This is very restrictive for the wastegate gas trying to get out, as it has to effectively go through two 90deg turns, before entering the port for the turbine's gas.
Good... Large bellmouth, where the turbine and wastegate dump into the large common open area of the bellmouth. This can create stalling turbulence of the escaping gas, as the wastegate gas immediately joins the turbine gas.
Best... Dedicated turbine and wastegate twin-port design, where the wastegate has its dedicated smaller port leading into long tubing which joins the main pipe about a foot down. This sepertion of the turbine and wastegate is the least restrictive design, as the two gas streams are kept apart, way after their immediate exit from the turbo. Magnex's Classc d/p is of this design, see here...
http://cgi.ebay.co.uk/IMPREZA-TURBO-EXHAUST-CLASSIC-DOWN-PIPE-MAGNEX-XFPSS02_W0QQitemZ330275630466QQcmdZViewItem?hash=i tem330275630466&_trkparms=72%3A1301|39%3A1|66%3A2| 65%3A12|240%3A1318&_trksid=p3286.c0.m14#ebayphotoh osting
(I have a £60 second hand one of these)
Bad... Outlet port for turbine only, with wastegate area blanked off (as per OEM cat d/p). This is very restrictive for the wastegate gas trying to get out, as it has to effectively go through two 90deg turns, before entering the port for the turbine's gas.
Good... Large bellmouth, where the turbine and wastegate dump into the large common open area of the bellmouth. This can create stalling turbulence of the escaping gas, as the wastegate gas immediately joins the turbine gas.
Best... Dedicated turbine and wastegate twin-port design, where the wastegate has its dedicated smaller port leading into long tubing which joins the main pipe about a foot down. This sepertion of the turbine and wastegate is the least restrictive design, as the two gas streams are kept apart, way after their immediate exit from the turbo. Magnex's Classc d/p is of this design, see here...
http://cgi.ebay.co.uk/IMPREZA-TURBO-EXHAUST-CLASSIC-DOWN-PIPE-MAGNEX-XFPSS02_W0QQitemZ330275630466QQcmdZViewItem?hash=i tem330275630466&_trkparms=72%3A1301|39%3A1|66%3A2| 65%3A12|240%3A1318&_trksid=p3286.c0.m14#ebayphotoh osting
(I have a £60 second hand one of these)
Last edited by joz8968; 12 October 2008 at 06:48 PM.
12 October 2008, 05:47 PM
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12 October 2008, 06:01 PM
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Yes, if you have the Nur Spec R system, it has 3'' centre and backbox. But it still has an OEM 2 3/8'' flange so as to suit most d/p's. The Magnex downpipe has an OEM flange, so will mate with your Nur Spec R's flange 
- just use a std 'donut' cone wire wool gasket, and it'll mate up. 
- just use a std 'donut' cone wire wool gasket, and it'll mate up.
Last edited by joz8968; 12 October 2008 at 06:04 PM.
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