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      11-19-2021, 12:59 PM   #6
MustGoFast
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Drives: '21 X5 M50i
Join Date: Apr 2008
Location: Wisconsin

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Quote:
Originally Posted by simrag View Post
No first hand experience with a M50i, but you never lose reducing backpressure in the downpipe with a turbocharged engine. Less backpressure = better spool = more low end power.
This is correct...

Even without turbo's the old theory of backpressure equaling low end power is at best situational, at worst an old wives tail. I can't count the number of non turbo cars I saw removing cats and opening up exhausts when I was in the tuner world and I never once saw a dyno drop power because of it.
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