Milltek Exhaust Query
#1
Milltek Exhaust Query
I'm just putting a few idea's together to take my MY05 uk sti up small stage and could do with some guidence regarding the exhaust.
What is the diameter of a Milltek system is my main question and will a 3" open neck decat down pipe marry up to it ok ?
I'm on a new age learning curve here, I know where I am with the generalised parts but it's the finer points that I have to re learn
Thanks
Simon
What is the diameter of a Milltek system is my main question and will a 3" open neck decat down pipe marry up to it ok ?
I'm on a new age learning curve here, I know where I am with the generalised parts but it's the finer points that I have to re learn
Thanks
Simon
#2
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You can get the Miltek in 2.5" and 3" mate. I have a full 3" turbo back sports catted Miltek system and apart from being fairly quiet it is a very good system. I am running 340bhp with it on
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Martin you may not have fully answered the question but you certainly jogged my memory !
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The standard dia for the STi is 2.75" If you want the 3" you'll have to specify the Spec C system. You can get the single scroll resonated downpipe to suit but you will have to be absolutely sure that if you already have an existing d/pipe, that it will match up for length. The Milltek is a system in it's own right.
JohnD
JohnD
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The standard STI downpipe CAT, will be restrictive for the gas flow, especially with your miltek system. Why didn't the last owner just put in a high flow sports cat.
What power are you running with this current exhaust setup. Sorry to say, but its a bit of a mish mash.
What power are you running with this current exhaust setup. Sorry to say, but its a bit of a mish mash.
#10
The standard dia for the STi is 2.75" If you want the 3" you'll have to specify the Spec C system. You can get the single scroll resonated downpipe to suit but you will have to be absolutely sure that if you already have an existing d/pipe, that it will match up for length. The Milltek is a system in it's own right.
JohnD
JohnD
I have found that Milltek sell a de cat down pipe which replaces the first 2 section both with cats in, this is a 3" open neck that fits to the 2.75" centre and rear.
Martin I have found out today that the oem exhaust is in 4 sections. The first is a down pipe plus cat, second short section with cat in it, third is centre section with resonator and forth is back box. What I can do now is make it a 3 section Milltek system, first down pipe, second centre section, third back box. This techinically makes it the same as a classic set up and the up pipe is cat less on the Sti so no need for me to look at changing that.
It's worked out a lot cheaper than I initially thought to re work the exhaust
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Measure any sections you're not sure about by wrapping a tape measure round it to get the circumference, C. Then determine the internal diameter, d, by:-
d = C divided by 3.14. Then subtract about 8-10mm (the thickness of the walls: c.4-5mm x 2).
But you might have reduced OEM-sized 2.625" mating flanges - despite a bore of 3".
d = C divided by 3.14. Then subtract about 8-10mm (the thickness of the walls: c.4-5mm x 2).
But you might have reduced OEM-sized 2.625" mating flanges - despite a bore of 3".
Last edited by joz8968; 09 January 2012 at 07:20 PM.
#13
Measure any sections you're not sure about by wrapping a tape measure round it to get the circumference, C. Then determine the internal diameter, d, by:-
d = C divided by 3.14. Then subtract about 8-10mm (the thickness of the walls: c.4-5mm x 2).
But you might have reduced OEM-sized 2.625" mating flanges - despite a bore of 3".
d = C divided by 3.14. Then subtract about 8-10mm (the thickness of the walls: c.4-5mm x 2).
But you might have reduced OEM-sized 2.625" mating flanges - despite a bore of 3".
Sorry about that it's the inner Moderator in me
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