MHD tune on stock downpipes

imske3000 · 09-03-2016, 07:07 PM

Hi Guys

Just looking for some advice on what MHD tune to run on stock 1M downpipes. I am thinking 'Stage 2' is ok as this is for the 135i with upgraded downpipes.

The other question is how 'free flowing' are the stock 1M downpipes?

martymil · 09-04-2016, 01:34 AM

The 1m Downpipes are the same as any aftermarket catted downpipes

From memory you will be limited by these to around 274rwk at best on unleaded fuel
depending on the dyno used

Take these out and leave the mid cats in and you will get around mid 280 rwk

with supporting mods

09-03-2016, 07:07 PM	#1
imske3000 Second Lieutenant 20 Rep 228 Posts Drives: AW 1M Join Date: Feb 2014 Location: Sydney iTrader: (1)	MHD tune on stock downpipes Hi Guys Just looking for some advice on what MHD tune to run on stock 1M downpipes. I am thinking 'Stage 2' is ok as this is for the 135i with upgraded downpipes. The other question is how 'free flowing' are the stock 1M downpipes?
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09-04-2016, 01:34 AM	#2
martymil Banned 389 Rep 2,186 Posts Drives: Garage is to big to list. Join Date: Jun 2013 Location: Sydney iTrader: (8)	The 1m Downpipes are the same as any aftermarket catted downpipes From memory you will be limited by these to around 274rwk at best on unleaded fuel depending on the dyno used Take these out and leave the mid cats in and you will get around mid 280 rwk with supporting mods
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