Trackday friendly 3" exhaust system?
04 January 2011, 01:30 AM
#1
Trackday friendly 3" exhaust system?
Howdy all,
I am looking for an exhaust system/backbox which is trackday friendly and can flow as good as my current setup.
I am currently running a fully decatted 3" system consisting of a 3" H&S decat downpipe, mated to a true full 3" Blitz Nur Spec R centre and backbox. This is very loud, and I very much doubt I could get close to the noise restrictions at some tracks.. so I am not even going to bother trying!
So suggestions? Will a good backbox suffice, or should I grab a long centre section and backbox?
Also, I'm guessing in going for a quieter system that I shouldn't need a map tweak or anything? The new exhaust will only be used for tracks, normal/road use will go back to the Blitz
Thanks
Edited to say its a UK Blobeye STi
I am looking for an exhaust system/backbox which is trackday friendly and can flow as good as my current setup.
I am currently running a fully decatted 3" system consisting of a 3" H&S decat downpipe, mated to a true full 3" Blitz Nur Spec R centre and backbox. This is very loud, and I very much doubt I could get close to the noise restrictions at some tracks.. so I am not even going to bother trying!
So suggestions? Will a good backbox suffice, or should I grab a long centre section and backbox?
Also, I'm guessing in going for a quieter system that I shouldn't need a map tweak or anything? The new exhaust will only be used for tracks, normal/road use will go back to the Blitz
Thanks
Edited to say its a UK Blobeye STi
Last edited by ScoobyDoo69; 04 January 2011 at 01:52 AM.
04 January 2011, 10:00 AM
#3
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Get in touch with Pete/Matt at Exhaustsuk and ask about their track friendly system which I am running on my wr1 - good enough for 700+ so will be good enough for the majority!
04 January 2011, 10:13 AM
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I wouldn't even consider just a back box with a Blitz centre - their routing seems to be slightly different from the factory exhaust and the 3" centre I bought from Cobra to make the system a 3" from the turbo has been a pig to fit. The back box comes out slightly further which sits better in terms of alignment with the rear bumper, but the tail is pushed up which required the bumper to be trimmed.
Also cobra 3" exhaust are a 3" OD whereas blitz has a 3" ID. I am getting the flange that mates to a 2.5" exhaust welded back on my blitz centre as it has the same ID at the neck as the cobra system (2.75").
If you want a genuine 3" you need revolution or RCM systems
Jon
Also cobra 3" exhaust are a 3" OD whereas blitz has a 3" ID. I am getting the flange that mates to a 2.5" exhaust welded back on my blitz centre as it has the same ID at the neck as the cobra system (2.75").
If you want a genuine 3" you need revolution or RCM systems
Jon
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04 January 2011, 01:09 PM
#12
For those recommeding the exhaustuk.com option, is it the SB04 as listed on this page?
http://www.cobrasport.com/exhaust/Su...2007%29/31/0/0
http://www.cobrasport.com/exhaust/Su...2007%29/31/0/0
04 January 2011, 01:25 PM
#14
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RCM does, I run a resonated 3" centre and its very quiet as the resonated section (a H&S down pipe and custom very, very quite backbox), is enormous compared to most so . There are some pics in my project thread if required.
04 January 2011, 01:56 PM
#15
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For those recommeding the exhaustuk.com option, is it the SB04 as listed on this page?
http://www.cobrasport.com/exhaust/Su...2007%29/31/0/0
http://www.cobrasport.com/exhaust/Su...2007%29/31/0/0
Really wanted the Rev system but it's alot of faith in the longevity of a back box as the centre is still unresonated. 
05 January 2011, 12:02 AM
#24
Thanks guys, all your input has been great so far. My main concern with the exhaustsuk.com and the Milltek exhausts are that they don't seem to be 3" internal diameter, like my downpipe and current Blitz exhaust.
I'm sure they flow well enough as many good power cars run them, but I am looking for the smallest difference in exhaust flow as possible for fear of disturbing my map! So that means the exhaust definitely has to have a 3" internal diameter. So that leaves me with RCM or Revolution I take it?
I'm sure they flow well enough as many good power cars run them, but I am looking for the smallest difference in exhaust flow as possible for fear of disturbing my map! So that means the exhaust definitely has to have a 3" internal diameter. So that leaves me with RCM or Revolution I take it?
05 January 2011, 12:17 AM
#25
I'm pretty sure the Cobra is 3" ? It wasn't smaller than my 3" Invidia downpipe anyway.
I wouldn't say that it is that silent though. I only have a sound clip on idle (cold start on E85 2000 rpm) http://www.youtube.com/watch?v=RfXrZaysLd8
Also the tail pipe could be a bit longer.
I wouldn't say that it is that silent though. I only have a sound clip on idle (cold start on E85 2000 rpm) http://www.youtube.com/watch?v=RfXrZaysLd8
Also the tail pipe could be a bit longer.
05 January 2011, 10:15 AM
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Where did you get that info from? Was it from speaking to Exhaustsuk?? Think I would have been struggling to get the power I have currently had mine (cobra) not been 3"!
