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10-01-2011, 10:21 PM | #1 |
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Secondary CATS delete - WOW!
Removed this mornig the secondary cat and... WOW!!
![]() The sound is incredible!! Especially the loud "TUM" on upshifting is gorgeous!! A greet modify for 80 $. I could not pare to drive and drive around ![]() |
10-02-2011, 09:15 PM | #4 |
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10-03-2011, 02:38 AM | #5 | |
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Is the sound louder in general or just different when you upshifting? |
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10-03-2011, 08:53 AM | #6 |
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It is a bit louder in general, you can ear it in my 2nd video.
Just perfect for my taste. But the best is the "bluuurrpppp" on upshifting and the rumbling on downshifting! |
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10-03-2011, 03:13 PM | #7 |
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Now you got me thinking about doing the same. Is there any power loss to this? Also can you put it back incase for inspection?
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10-03-2011, 08:38 PM | #8 |
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10-15-2011, 12:02 AM | #9 |
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10-18-2011, 02:02 PM | #11 |
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sounds great
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10-23-2011, 08:27 PM | #13 |
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06-16-2012, 02:06 PM | #15 | |
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08-14-2012, 09:41 PM | #17 |
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In the N54 engine, the 2 primary cats are part of the downpipes, hence are practically located at 15-20 cm from the turbos. They are the most effective in reducing emissions and the most restrictive in term of exhaust flow, quitting power and torque. Removing the primary cats gan give you aprox 20-30 whp, depending on the chip tuning you run, and less turbo lag. The secondary cats are located aprox in the center of the car, welded to the midpipes. Removing them does NOT improve power and torque nor reduce turbo lag. Probably the emissions increase and it depends on how much severe are the laws where you live to go with this mod or not. For what concern the Z4 35i, I think this is the best mod to have a louder sound and an amplified upshift "TUM" @ very low cost, at least in Italy.
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08-19-2012, 03:39 PM | #19 |
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35i and 35is share the same exhaust parts and layout except for the rear end mufflers, sligthly different. This mod should give the same sound increase in both models.
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10-01-2012, 12:03 PM | #21 | |
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