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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning M performance exhaust sound on 1 tip

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      11-25-2014, 01:40 PM   #1
Enovoc
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M performance exhaust sound on 1 tip

I installed my M performance exhaust and the sound only comes out on one tip.
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      11-25-2014, 01:47 PM   #2
Kgolf31
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Wait till after startup.

There is a vacuum valve that is closed during cold start-ups. It will open when ready.

If you didn't plug the vacuum valve back into the new exhaust, well there is your issue
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      11-25-2014, 01:48 PM   #3
Enovoc
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Quote:
Originally Posted by Kgolf31 View Post
Wait till after startup.

There is a vacuum valve that is closed during cold start-ups. It will open when ready.

If you didn't plug the vacuum valve back into the new exhaust, well there is your issue
The valve is plugged in. I love in new york so it's freezing maybe that's the case haha thank you
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      11-25-2014, 01:50 PM   #4
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Quote:
Originally Posted by Covo_M View Post
The valve is plugged in. I love in new york so it's freezing maybe that's the case haha thank you
Takes a bit for the valve to open. I know on my dad's F22 it is a couple minutes it seems.

Take the car around the block, valve should open if not I'd check to see if it is seized or something
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      11-25-2014, 02:19 PM   #5
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Quote:
Originally Posted by Kgolf31 View Post
Takes a bit for the valve to open. I know on my dad's F22 it is a couple minutes it seems.

Take the car around the block, valve should open if not I'd check to see if it is seized or something
It makes a weird sound after a few minutes than they both open up.
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      11-25-2014, 03:46 PM   #6
Kgolf31
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Quote:
Originally Posted by Covo_M View Post
It makes a weird sound after a few minutes than they both open up.
Cool, you're all good.

The weird sound is just from the engine cold starting. The engine runs at increased RPMs to warm up the cats to make it more efficient.

Perfectly normal operation (and cold start happens on all cars)

Enjoy@
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      11-25-2014, 04:08 PM   #7
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Quote:
Originally Posted by Kgolf31 View Post
Cool, you're all good.

The weird sound is just from the engine cold starting. The engine runs at increased RPMs to warm up the cats to make it more efficient.

Perfectly normal operation (and cold start happens on all cars)

Enjoy@
Thanks haha! I was stressing out good to hear it's normal the exhaust sounds great though I love the popping.
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