11-05-2021, 03:17 AM | #1 |
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cat less downpipe decrease acceleration
Hi bimmers, I am wondering if anyone had experience on bmw x5/x6 m50i models specifically on modified downpipe.
I heard that a cattless downpipe decreases torque at lower rpms, would it be very significant? How worth it was the extra sound compared to the decrease in torque? thank you! |
11-05-2021, 06:48 AM | #2 |
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Ive not heard of any decrease but if so it will not really be noticeable.
On the other hand, the sound difference will certainly be noticeable. |
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11-15-2021, 07:35 AM | #3 | |
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11-16-2021, 12:25 PM | #4 |
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Can't speak for the 50i, but my 40i spools faster/louder and pulls hard. Although, I also have a tune and the M performance exhaust.
I had catless dps on my N54 335i and it was day and night.
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11-16-2021, 01:16 PM | #5 | |
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11-19-2021, 12:59 PM | #6 | |
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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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