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      01-17-2016, 06:33 PM   #1
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No more cats but a new tune?

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I've ran a cat back system over the past year on my E90 M3 along with an ECU tune, DCT and coding flash. But I just decided to go full cat less. Do I really have to pay another grand for a new flash to accommodate the new setup? Or is there a better alternative?
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      01-17-2016, 07:00 PM   #2
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Quote:
Originally Posted by E90//M View Post
I've ran a cat back system over the past year on my E90 M3 along with an ECU tune, DCT and coding flash. But I just decided to go full cat less. Do I really have to pay another grand for a new flash to accommodate the new setup? Or is there a better alternative?
What kind of tune do you currently have? In my experience with ESS, when I went catless, my tune was upgraded at no cost.

I've got a BPM stage 2 tune now, but I think they do the same with updating tunes.
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      01-17-2016, 07:04 PM   #3
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Originally Posted by dcpatters View Post
What kind of tune do you currently have? In my experience with ESS, when I went catless, my tune was upgraded at no cost.

I've got a BPM stage 2 tune now, but I think they do the same with updating tunes.
It is a BPM tune and DCT flash
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      01-17-2016, 07:09 PM   #4
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Originally Posted by E90//M View Post
It is a BPM tune and DCT flash
I'd send them an email, their customer service is outstanding.
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      01-17-2016, 08:20 PM   #5
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Catless xpipe requires a catless tune to squeeze out 5 to 8 more hp as well as turn CEL light off. But aside from thst it's not necessary
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      01-19-2016, 02:47 PM   #6
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Just went catless on Friday and I did not do anything except tune the o2 for higher flow based on Alex@Alpine which tunes out the CEL. Nothing else was changed. At the track i was getting way higher top speeds for some reason so the car was either making more power or I was just getting better.
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      01-19-2016, 03:17 PM   #7
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Going catless is by far single most big gain on these cars. A simple high flow air filter and catless xpipe and you have good 25bph.
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      01-19-2016, 03:23 PM   #8
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You will need a update on your tune. Have you tried contact BPM to see what the cost to upgrade would be?
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      01-19-2016, 04:14 PM   #9
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i believe any changes to the bpm tune file cost $100
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      01-20-2016, 08:18 PM   #10
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Quote:
Originally Posted by M3 Number 86 View Post
Just went catless on Friday and I did not do anything except tune the o2 for higher flow based on Alex@Alpine which tunes out the CEL. Nothing else was changed. At the track i was getting way higher top speeds for some reason so the car was either making more power or I was just getting better.
+1 I went this route as well since i was fine with the stock tune. with the alpine o2 tune your car can still pass the OBD2 tests . very happy with the performance with just a drop in filter and test pipes.
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      01-21-2016, 04:39 AM   #11
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Care to elaborate more on what the alpine o2 tune actually does?


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Originally Posted by azndrunk74 View Post
+1 I went this route as well since i was fine with the stock tune. with the alpine o2 tune your car can still pass the OBD2 tests . very happy with the performance with just a drop in filter and test pipes.
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      01-21-2016, 04:48 AM   #12
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Quote:
Originally Posted by E90//M View Post
I've ran a cat back system over the past year on my E90 M3 along with an ECU tune, DCT and coding flash. But I just decided to go full cat less. Do I really have to pay another grand for a new flash to accommodate the new setup? Or is there a better alternative?
I purchased 02 extenders from fabspeed, i got them for dirt cheap, but they list for 150. Simply install between exhaust pipe and O2. Havent had a fault code for 5000 miles and my readiness monitors are all "complete"
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      01-21-2016, 04:54 AM   #13
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Here is picture of the extenders installed on the post-cat O2s... https://instagram.com/p/_algLdCiyW/

Sorry for my Instagram link, I'm still learning how to- forum via mobile device
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      01-21-2016, 05:42 PM   #14
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Quote:
Originally Posted by Silverwolf View Post
Care to elaborate more on what the alpine o2 tune actually does?
as stated above it lets the post cat O2 sensor account for higher flow which in turn prevents a CEL from lighting up. other tunes simply suppress the CEL by leaving the rear O2 in a not "ready state" which will not allow you to pass any OBD2 related emissions tests.
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      01-21-2016, 05:43 PM   #15
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Quote:
Originally Posted by Fikster View Post
I purchased 02 extenders from fabspeed, i got them for dirt cheap, but they list for 150. Simply install between exhaust pipe and O2. Havent had a fault code for 5000 miles and my readiness monitors are all "complete"
i'm surprised this worked for you..many others have tried the j-style o2 extensions with no luck. you're one of the lucky ones!
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