[Kendricks f30]

How much more hp and tq could I get with an aftermarket catted dp opposed to the stock catted dp? And is it worth buying one. I understand catless would create more power but I'm still within the warranty. Any input is appreciated, thanks.

[mike@x-ph.com]

If you are not adding a tune increase would be ~8 whp max , with a tune your are looking at ~15 whp increase

[Kendricks f30]

Originally Posted by mike@x-ph.com

If you are not adding a tune increase would be ~8 whp max , with a tune your are looking at ~15 whp increase

OK thanks for the input. I'm also selling my stock exhaust off a 2014 328. What would you put a price on for something like that. It has 20k miles on it.

[alohasurftoad]

Originally Posted by Kendricks f30

. I understand catless would create more power but I'm still within the warranty. Any input is appreciated, thanks.

what is your reasoning between catted and catless and how it affects warranty?

[Kendricks f30]

Originally Posted by alohasurftoad

what is your reasoning between catted and catless and how it affects warranty?

BMW doesn't want to see a catless downpipe on any of there cars if they are going to do any warranty work. One of my buddy's had a 128 with 450 whp and he had a tough time finding anyone who would even work on it and it wasn't even under warrenty. Not sure exactly how it affects the warranty but it does.

[alohasurftoad]

Originally Posted by Kendricks f30

BMW doesn't want to see a catless downpipe on any of there cars if they are going to do any warranty work. One of my buddy's had a 128 with 450 whp and he had a tough time finding anyone who would even work on it and it wasn't even under warrenty. Not sure exactly how it affects the warranty but it does.

my thinking is that unless it is oem, an aftermarket catted down pipe would be frowned upon as well. maybe not as much as a catless but still a warranty risk nevertheless. also, some catted dp can still cause a CEL. personally, i'd still do a catted because i don't care for the unfiltered exhaust smell. there's a warranty risk with any aftermarket modification.

[mike@x-ph.com]

Did you ask your dealership? Some of them are fine with mods

From my experience, most dealerships will not care about your mods unless these mods are the reason behind your dealership visit

[Kendricks f30]

Originally Posted by mike@x-ph.com

Did you ask your dealership? Some of them are fine with mods

From my experience, most dealerships will not care about your mods unless these mods are the reason behind your dealership visit

I haven't asked yet next time I bring her in for service I'll check.

[Kendricks f30]

Originally Posted by mike@x-ph.com

Did you ask your dealership? Some of them are fine with mods

From my experience, most dealerships will not care about your mods unless these mods are the reason behind your dealership visit

Also if I go jb4 will it delete the code automatically?

[mike@x-ph.com]

Originally Posted by Kendricks f30

Also if I go jb4 will it delete the code automatically?

yes the Jb4 will hide the code

[330i-M-sport]

What about the jb1 ?

[mike@x-ph.com]

Originally Posted by 320i-bmw

What about the jb1 ?

Jb1 will not hide the code ... If you have high flow downpipes, get a JB4

If you are keeping your car stock and only using pump gas, get the JB stage 1

[ACR3597]

Does the Catted downpipe produce a turbo spool sound like the catless downpipe? Also does the Catted downpipe produce a smell? I read a few saying it still produces some smell.

[mike@x-ph.com]

Originally Posted by ACR3597

Does the Catted downpipe produce a turbo spool sound like the catless downpipe? Also does the Catted downpipe produce a smell? I read a few saying it still produces some smell.

Sound will be louder on the catless

no smell with catted

[STR8-6IX]

a downpipe is still a downpipe, I doubt your dealership would be fine with a catted one if they are not mod friendly

have you sold your exhaust system yet? I recommend you check how it sounds with the upgraded downpipe before getting rid of it - stock BMW exhausts are really not a bad design.

if you are still not happy with the sound, an axle-back makes more sense then replacing the whole exhaust system.