Cat delete?

amrits_12 · 02-11-2021, 11:46 PM

I just bought a white on black 2013 e70 x5m and I love it. I have a couple of plans planned lower spacers tune. But first wanna make it louder. Can I just delete the cats? Take it to a shop and ask them to cut them and straight pipe them? I havent seen anyone do this here not sure why. Or should I just buy new dp. OR maybe new exhaust. Maybe some megan racings. Or should I do both? I dont want any drone at all as it is my dd but dont care how loud a cold start is as I live on a acreage and dont really have neighbours.
thanks for any help

Sophisticated Redneck · 02-12-2021, 07:57 AM

You definitely want to buy aftermarket, many to choose from. When you add downpipes to a n63/s63, it will get louder but also introduces an "upshift rattle". Some don't care but many do. I personally hate that raspy rattle sound it gets on upshifts when downpipes are added. It's caused by the resonators being tuned specific to the cats. You can fix by replacing the resonators and tossing in an x-pipe. Pull up a search window on this forum and search for x5m resonators. Should pull a thread from last year about all of this with videos and sound clips from another member who did downpipes.

Edit: Found the thread I was talking about : https://www.xbimmers.com/forums/show...+rattle&page=1

I would recommend you do the downpipes first and if you hate the sound, order up the resonators and x-pipe we used In that thread. The combo of downpipes, x-pipe+ race resonators is perfect IMHO.

BigHunk · 02-12-2021, 08:44 AM

Primary cats are main sound restrictions on those cars, sound will definitively be louder with downpipes.

Gas smell will also be very present after downpipes, there is option of catted pipes(300 cell)

which is more expensive, but reducing gas smell, while still improving exhaust flow compared to OEM.

One more thing, avoid VRSF, because fitment is bad.

Movado750 · 02-12-2021, 10:17 AM

I did cat delete. would never go back sound is awesome and you have to get a tune to make the performance.

amrits_12 · 02-12-2021, 02:04 PM

Dont care too much about the smell, I've heard its not too bad its manageable. I want a cheap solution for now and later on in the summer get really nice ones.

Movado750 did you just take out the cats and straight pipe it where the cats where? Is that possible. On all my other sport cars I take out the cats and its the perfect noise but no one has talked about it on e70 forums which is concerning. I already like the tone of the car just want it to be louder.

Sophisticated Redneck can you describe the upshift rattle? Is it what other people call upshift farts? Personally I do not like that.

Sophisticated Redneck · 02-13-2021, 09:45 AM

The smell is powerful but you get used to it and maybe even it like it a bit, especially if a Prius with it's windows open gets behind you🤣. Mix 3 gallons of E85 with a full tank and actually improves not only your timing and power but the smell too. Don't go over 3 though, fuel trims get maxed when you get much past 4 and will get lean codes .

Yep upshift farts is a good description of it. Not as bad on the M as the 50i due to M's header and Muffler design. It's a pretty subjective thing and doesn't bother everyone so do your downpipes first and if you don't like the sound, swap in the resonators and x-pipe.

amrits_12 · 02-14-2021, 08:32 PM

Thinking of just going to shop cutting off the cats. If I dont like it I'll just get a axle back. Will post back whenever I get it done

Movado750 · 02-15-2021, 04:23 PM

Quote:

Originally Posted by amrits_12

Dont care too much about the smell, I've heard its not too bad its manageable. I want a cheap solution for now and later on in the summer get really nice ones.

Movado750 did you just take out the cats and straight pipe it where the cats where? Is that possible. On all my other sport cars I take out the cats and its the perfect noise but no one has talked about it on e70 forums which is concerning. I already like the tone of the car just want it to be louder.

Sophisticated Redneck can you describe the upshift rattle? Is it what other people call upshift farts? Personally I do not like that.

I put ARM catless down pipes in. and I have Dinan Full exhaust.

Yes you can smell it pretty well. I like it. nothing in the cabin only when the windows are down.

zoom750 · 02-15-2021, 10:23 PM

If you're going to cut up the cats, why not just gut them?

https://www.xbimmers.com/forums/show...ght=hollow+cat

amrits_12 · 02-16-2021, 12:03 PM

Does it really matter if u gut the cats or just take them off? Figure it woukd be easier to take them off and weld in a pipe. And if u wanted to maybe put them back in if I wanted. I'm probably getting a e92 m3 so I don't want to dump to much money in the x5 so looking for thr cheapest solution for better sound. I went you tube and listening to some megan exhaust and They sound the same as stock...? Anyone with a megan exhaust want to chime in and tell me otherwise? Maybe I just can't tell online

amrits_12 · 02-16-2021, 12:34 PM

Also if I do get a catless dp or just take out the cats, will it throw codes? Will I need a tune?

02-11-2021, 11:46 PM	#1
amrits_12 New Member 1 Rep 8 Posts Drives: e70 x5m Join Date: Feb 2021 Location: Calgary, Alberta iTrader: (0)	Cat delete? I just bought a white on black 2013 e70 x5m and I love it. I have a couple of plans planned lower spacers tune. But first wanna make it louder. Can I just delete the cats? Take it to a shop and ask them to cut them and straight pipe them? I havent seen anyone do this here not sure why. Or should I just buy new dp. OR maybe new exhaust. Maybe some megan racings. Or should I do both? I dont want any drone at all as it is my dd but dont care how loud a cold start is as I live on a acreage and dont really have neighbours. thanks for any help
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02-12-2021, 07:57 AM	#2
Sophisticated Redneck Lieutenant Colonel 1416 Rep 1,564 Posts Drives: 2012 BMW X5 50i Join Date: Jul 2018 Location: CA iTrader: (0)	You definitely want to buy aftermarket, many to choose from. When you add downpipes to a n63/s63, it will get louder but also introduces an "upshift rattle". Some don't care but many do. I personally hate that raspy rattle sound it gets on upshifts when downpipes are added. It's caused by the resonators being tuned specific to the cats. You can fix by replacing the resonators and tossing in an x-pipe. Pull up a search window on this forum and search for x5m resonators. Should pull a thread from last year about all of this with videos and sound clips from another member who did downpipes. Edit: Found the thread I was talking about : https://www.xbimmers.com/forums/show...+rattle&page=1 I would recommend you do the downpipes first and if you hate the sound, order up the resonators and x-pipe we used In that thread. The combo of downpipes, x-pipe+ race resonators is perfect IMHO. Last edited by Sophisticated Redneck; 02-12-2021 at 08:33 AM..
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02-12-2021, 08:44 AM	#3
BigHunk ///M 270 Rep 385 Posts Drives: X5M , iX , S1000XR Join Date: Jun 2018 Location: Edmonton iTrader: (0)	Primary cats are main sound restrictions on those cars, sound will definitively be louder with downpipes. Gas smell will also be very present after downpipes, there is option of catted pipes(300 cell) which is more expensive, but reducing gas smell, while still improving exhaust flow compared to OEM. One more thing, avoid VRSF, because fitment is bad. __________________ not rich enough to buy cheap
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02-12-2021, 10:17 AM	#4
Movado750 Private First Class 21 Rep 166 Posts Drives: 2012 X5 M Sport Join Date: Feb 2017 Location: Minnesota iTrader: (0)	I did cat delete. would never go back sound is awesome and you have to get a tune to make the performance.
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02-12-2021, 02:04 PM	#5
amrits_12 New Member 1 Rep 8 Posts Drives: e70 x5m Join Date: Feb 2021 Location: Calgary, Alberta iTrader: (0)	Dont care too much about the smell, I've heard its not too bad its manageable. I want a cheap solution for now and later on in the summer get really nice ones. Movado750 did you just take out the cats and straight pipe it where the cats where? Is that possible. On all my other sport cars I take out the cats and its the perfect noise but no one has talked about it on e70 forums which is concerning. I already like the tone of the car just want it to be louder. Sophisticated Redneck can you describe the upshift rattle? Is it what other people call upshift farts? Personally I do not like that.
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02-13-2021, 09:45 AM	#6
Sophisticated Redneck Lieutenant Colonel 1416 Rep 1,564 Posts Drives: 2012 BMW X5 50i Join Date: Jul 2018 Location: CA iTrader: (0)	The smell is powerful but you get used to it and maybe even it like it a bit, especially if a Prius with it's windows open gets behind you🤣. Mix 3 gallons of E85 with a full tank and actually improves not only your timing and power but the smell too. Don't go over 3 though, fuel trims get maxed when you get much past 4 and will get lean codes . Yep upshift farts is a good description of it. Not as bad on the M as the 50i due to M's header and Muffler design. It's a pretty subjective thing and doesn't bother everyone so do your downpipes first and if you don't like the sound, swap in the resonators and x-pipe.
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02-14-2021, 08:32 PM	#7
amrits_12 New Member 1 Rep 8 Posts Drives: e70 x5m Join Date: Feb 2021 Location: Calgary, Alberta iTrader: (0)	Thinking of just going to shop cutting off the cats. If I dont like it I'll just get a axle back. Will post back whenever I get it done
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02-15-2021, 10:23 PM	#9
zoom750 Private 10 Rep 60 Posts Drives: 2013 X5M Join Date: Jul 2020 Location: NJ iTrader: (0)	If you're going to cut up the cats, why not just gut them? https://www.xbimmers.com/forums/show...ght=hollow+cat
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02-16-2021, 12:03 PM	#10
amrits_12 New Member 1 Rep 8 Posts Drives: e70 x5m Join Date: Feb 2021 Location: Calgary, Alberta iTrader: (0)	Does it really matter if u gut the cats or just take them off? Figure it woukd be easier to take them off and weld in a pipe. And if u wanted to maybe put them back in if I wanted. I'm probably getting a e92 m3 so I don't want to dump to much money in the x5 so looking for thr cheapest solution for better sound. I went you tube and listening to some megan exhaust and They sound the same as stock...? Anyone with a megan exhaust want to chime in and tell me otherwise? Maybe I just can't tell online
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02-16-2021, 12:34 PM	#11
amrits_12 New Member 1 Rep 8 Posts Drives: e70 x5m Join Date: Feb 2021 Location: Calgary, Alberta iTrader: (0)	Also if I do get a catless dp or just take out the cats, will it throw codes? Will I need a tune?
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