[extide]

Can you do a full exhaust system without throwing a CEL? Like at least a cat-back -- not necessarily the downpipes. These cars have the extra OPF's in them -- does removing those throw a code?

[M_Power Rob]

Originally Posted by extide

Can you do a full exhaust system without throwing a CEL? Like at least a cat-back -- not necessarily the downpipes. These cars have the extra OPF's in them -- does removing those throw a code?

Yes, you can do a catback without a cel.

[emm2wc]

Originally Posted by extide

Can you do a full exhaust system without throwing a CEL? Like at least a cat-back -- not necessarily the downpipes. These cars have the extra OPF's in them -- does removing those throw a code?

You can check out LEIB Engineering (https://www.leib-engineering.de/opf-...-m3-g80-g81-de), they offer OPF deleter kit for G80/G82/G87 that handles both CAT and OPF.

[Info@mad-us.com]

I believe you are in the USA? If so the then yes, you can do our midpipe and axle back system without any cel issues.

Downpipes are the only part that will cause a cel issue without a tune but there are ways around that as well.

[mike@x-ph.com]

Originally Posted by extide

Can you do a full exhaust system without throwing a CEL? Like at least a cat-back -- not necessarily the downpipes. These cars have the extra OPF's in them -- does removing those throw a code?

only some euro cars have the extra opf, US cars dont use OPF

as long as you dont mess with the downpipes, you wont get a CEL

[extide]

Thanks all!

[mike@x-ph.com]

Originally Posted by extide

Thanks all!

What system are you interested in?

[SloppySquid]

Originally Posted by mike@x-ph.com

What system are you interested in?

If I did mid pipes and axel back vs including a downpipe and full exhaust how much louder will the downpipe be?