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Decat donwpipe install options
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burtzz is Offline
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Default Decat donwpipe install options - 27th June 2018, 03:24 PM

Hey guys,

I got a cooper s N18 and Iím finally installing a downpipe (no cat)
It has already some extra parts like the airtec intercooler, so Iím expecting after the downpipe to do another ecu tunning and get to around 235hp. (Playing safe )

I have a question on how should I install the downpipe. I have already asked around and got 3 different opinions so Iím a bit confused

As far as I know there are 3 logic options when installing the downpipe:

Option 1 - You know that oem metal heat shield for heat protection, between the downpipe and the engine block?
This option gets that removed completely, only the top heat shield gets back in, the small part that covers also the oil line to the turbo.
I heard from a guy that leaving the heat shield big pieces on causes vibration. So this suggestion came along with a comment saying the temps are safe, they are by far lower than a pipe with a catalytic inside (true?). So no arm can be done to the engjne. Also, the heat shield removal simplifies the downpipe installation.

2 - suggestion from another guy:
Remove the oem heat shield piece, thatís ok, but buy and put a titanium heat band around the downpipe because of the heat.

3 - the last suggestion I got was to completely discard those options and just leave all oem heat shields on, downpipe has to fit.
Thereís no vibration issues at all.

So whatís the usual and suggested approach?

The car is no 24h red line monster, itís a weekend and roadtrip car, but it does see the track 2 to 3 times a year and will get a tune. Temps are also high in here (30C) in the summer at least.

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Chris R53 is Offline
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Default 27th June 2018, 06:15 PM

I fitted a sports cat to my GP and all the heatshields went back on (the bolts are fiddly but doable).
I had no vibrations/rattles and if anything, it stopped the resonance that the top heatshield used to have on idle
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