JB4 w/ xdrive stock midpipe question

reighnman · 05-08-2017, 05:50 PM

Since xdrive has 1 cat in the DP and 1 in the midpipe, do you need to decat the midpipe as well to run map2 or will it run fine with 1 cat (and a catless dp)?

Bestodabest · 05-08-2017, 05:55 PM

Which chassis? I don't believe all X-drive's have secondary cats.

reighnman · 05-08-2017, 06:20 PM

14' F32 435iX

Bestodabest · 05-08-2017, 06:28 PM

I have the same; I only recall seeing a resonator on the mid pipe. Someone correct me if I'm wrong.

zole2112 · 05-11-2017, 11:48 AM

I only have a resonator between the downpipe and muffler, no other cat. 2013 335i xdrive F30 N55

mike@x-ph.com · 05-11-2017, 03:48 PM

Quote:

Originally Posted by reighnman

Since xdrive has 1 cat in the DP and 1 in the midpipe, do you need to decat the midpipe as well to run map2 or will it run fine with 1 cat (and a catless dp)?

All you need to do is change the stock DP for a catless or high flow cat downpipe

reighnman · 05-11-2017, 04:22 PM

For some reason I thought xdrive had a single cat in the DP and a cat in the midpipe but sounds like I was mistaken which is easier for me anyways

Jeff@TopGearSolutions · 05-11-2017, 05:43 PM

Just the downpipe nearest the engine needs to be replaced, that is the biggest restriction.

Although it's not say there won't be benefit in removing all cats. However, the removal of cats may lead to a raspy note so I'd replace with a resonator for the secondary cat, personally.

GTBrandon · 05-12-2017, 10:34 PM

I have the F34 GT and we have a "secondary cat". For performance and sound purposes, all you need to worry about is the main cat in the downpipe. There is a NOX Cat farther down the line, about 6 inches long, about halfway back. I removed this along with my resonator to have a full straight pipe back to the muffler, but again, it's not necessary.

STR8-6IX · 05-15-2017, 05:53 PM

Quote:

Originally Posted by Bestodabest

Which chassis? I don't believe all X-drive's have secondary cats.

The f30 does not have secondary cats in the midpipe

Bestodabest · 05-16-2017, 01:11 AM

Quote:

Originally Posted by STR8-6IX

The f30 does not have secondary cats in the midpipe

Thanks for the confirmation!

05-08-2017, 05:50 PM	#1
reighnman Private First Class 25 Rep 115 Posts Drives: F82 6MT ZCP CBB Join Date: May 2017 Location: Midwest iTrader: (0)	JB4 w/ xdrive stock midpipe question Since xdrive has 1 cat in the DP and 1 in the midpipe, do you need to decat the midpipe as well to run map2 or will it run fine with 1 cat (and a catless dp)? __________________ 2016 X3 Alpine White sold 2017 M4 6MT Sakhir Orange : ZCP//CCB//BM3//LCI sold 2014 435i 6MT xdrive : JB4//LCI
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05-08-2017, 05:55 PM	#2
Bestodabest Private First Class 37 Rep 122 Posts Drives: 2014 435i Xdrive Join Date: Apr 2017 Location: Toronto iTrader: (0)	Which chassis? I don't believe all X-drive's have secondary cats.
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05-08-2017, 06:20 PM	#3
reighnman Private First Class 25 Rep 115 Posts Drives: F82 6MT ZCP CBB Join Date: May 2017 Location: Midwest iTrader: (0)	14' F32 435iX __________________ 2016 X3 Alpine White sold 2017 M4 6MT Sakhir Orange : ZCP//CCB//BM3//LCI sold 2014 435i 6MT xdrive : JB4//LCI
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05-08-2017, 06:28 PM	#4
Bestodabest Private First Class 37 Rep 122 Posts Drives: 2014 435i Xdrive Join Date: Apr 2017 Location: Toronto iTrader: (0)	I have the same; I only recall seeing a resonator on the mid pipe. Someone correct me if I'm wrong.
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05-11-2017, 11:48 AM	#5
zole2112 Modder of everything I own 147 Rep 491 Posts Drives: 2013 335i Xdrive Join Date: Mar 2017 Location: Appleton, WI iTrader: (0)	I only have a resonator between the downpipe and muffler, no other cat. 2013 335i xdrive F30 N55
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05-11-2017, 04:22 PM	#7
reighnman Private First Class 25 Rep 115 Posts Drives: F82 6MT ZCP CBB Join Date: May 2017 Location: Midwest iTrader: (0)	For some reason I thought xdrive had a single cat in the DP and a cat in the midpipe but sounds like I was mistaken which is easier for me anyways __________________ 2016 X3 Alpine White sold 2017 M4 6MT Sakhir Orange : ZCP//CCB//BM3//LCI sold 2014 435i 6MT xdrive : JB4//LCI
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05-11-2017, 05:43 PM	#8
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Just the downpipe nearest the engine needs to be replaced, that is the biggest restriction. Although it's not say there won't be benefit in removing all cats. However, the removal of cats may lead to a raspy note so I'd replace with a resonator for the secondary cat, personally.
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05-12-2017, 10:34 PM	#9
GTBrandon Captain 260 Rep 709 Posts Drives: 13' M3 Competition Join Date: Dec 2016 Location: Northern VA iTrader: (2)	I have the F34 GT and we have a "secondary cat". For performance and sound purposes, all you need to worry about is the main cat in the downpipe. There is a NOX Cat farther down the line, about 6 inches long, about halfway back. I removed this along with my resonator to have a full straight pipe back to the muffler, but again, it's not necessary. __________________ Current: 12' E70 X5D \| 04' Yamaha Warrior Past: 13' Audi S6 \| 13' E70 X5M \| 13' E92 M3 Comp \| 14' BMW 335xi GT \| 95' E36 M3 \| 84' BMW 733i \| 06' Porsche Boxster S \| 15' Jeep Grand Cherokee \| 06' Acura TL \| 85' Honda Shadow VT700 \| 05’ Yamaha R6 \| 12’ Triumph Tiger
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