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      04-19-2021, 12:07 PM   #1
Feelin Nauti
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Catless Down Pipes... ARM or VRSF plus mufflers

After much research, discussions and thought I decided to go with catless down pipes for my wife's 14 650i M sport. It seems that here in Houston Texas I should be able to pass inspections if I turn off the CEL with a tune.

Does anyone have any input or opinion of the ARM vs. VRSF downpipes ?

She want quicker spools and the added HP gains but does not want much added sound as the convertible already has more road noise then her M4 hardtop did.

I will be taking DB readings in and out of the car through out all of the exhaust mods I will be experiencing.

After the Catless down pipes is when I will decide on the mufflers to keep closer to stock DB levels with the added deeper tone and finally being able to hear the spool of the turbos.

My thoughts are... Catless down pipes, X pipe, stock resonators and Flowmaster 40 series Delta Flow. Offset in with dual outs for the quad tips

I know that most guys want much louder and just run muffler delete but I am trying to keep the wifey happy..

Thoughts,
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2014 650i M Sport Frozen White Matte Metallic
2015 X5 M Sport 50i Mineral White
2012 650I Conv Sapphire Black
2013 Harley Softail, Road King, Road Glide show bikes
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      04-19-2021, 08:46 PM   #2
AccordTR
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Quote:
Originally Posted by Feelin Nauti View Post
After much research, discussions and thought I decided to go with catless down pipes for my wife's 14 650i M sport. It seems that here in Houston Texas I should be able to pass inspections if I turn off the CEL with a tune.

Does anyone have any input or opinion of the ARM vs. VRSF downpipes ?

She want quicker spools and the added HP gains but does not want much added sound as the convertible already has more road noise then her M4 hardtop did.

I will be taking DB readings in and out of the car through out all of the exhaust mods I will be experiencing.

After the Catless down pipes is when I will decide on the mufflers to keep closer to stock DB levels with the added deeper tone and finally being able to hear the spool of the turbos.

My thoughts are... Catless down pipes, X pipe, stock resonators and Flowmaster 40 series Delta Flow. Offset in with dual outs for the quad tips

I know that most guys want much louder and just run muffler delete but I am trying to keep the wifey happy..

Thoughts,
I live in Canada so we don't have emissions testing but I have tons of USA friends that do. Turning of the cel via tune etc only removes the error code but you still fail the test they say. Basically it will read 'not ready'. Not sure how it is where you live but they all have to swap back their stock dps every time they test and then swap out again. Luckily here no one cares lol

As for the pipes, both will provided the same gains when paired with a tune. Arm are a bit hit or miss on fitment so you kinda roll the dice.
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