[tsixtial]

I am new to the M3 world so I apologize for such a noob question.

Do you need to get a tune on these cars if you upgrade anything that increases air flow such as downpipe/intakes? Or can we just upgrade and be okay (safe)?

[PLife]

If you have a car without particulate filters (US) and you get downpipes with at least 200 cell catalytic converters in them no tune required.

[mike@x-ph.com]

Originally Posted by tsixtial

I am new to the M3 world so I apologize for such a noob question.

Do you need to get a tune on these cars if you upgrade anything that increases air flow such as downpipe/intakes? Or can we just upgrade and be okay (safe)?

no tune required with any downpipes or intakes, but the tune gets you the most value for your money.

[G80SWFL]

Originally Posted by mike@x-ph.com

no tune required with any downpipes or intakes, but the tune gets you the most value for your money.

I would assume if it's catless downpipe you need a tune if not you will have a CEL?

[mike@x-ph.com]

Originally Posted by G80SWFL

I would assume if it's catless downpipe you need a tune if not you will have a CEL?

Correct

[Baylorguy]

Originally Posted by mike@x-ph.com

Correct

For those of us that live in a county where there is no sniffer test, I'd assume keeping the second set of cats (midpipes) and getting catless Downpipes with tune would be a nice option? Would also assume keeping secondary cats would keep smell in check, especially if running an ethanol tune.

[mike@x-ph.com]

Originally Posted by Baylorguy

For those of us that live in a county where there is no sniffer test, I'd assume keeping the second set of cats (midpipes) and getting catless Downpipes with tune would be a nice option? Would also assume keeping secondary cats would keep smell in check, especially if running an ethanol tune.

You wont pass smog with catless downpipes

[filostrato]

Originally Posted by tsixtial

I am new to the M3 world so I apologize for such a noob question.

Do you need to get a tune on these cars if you upgrade anything that increases air flow such as downpipe/intakes? Or can we just upgrade and be okay (safe)?

From the posts I've seen on the X3M builds with the S58, anyone replacing downpipes is going with a tune to make use of the extra flow. Still early in the G8X lifecycle to have many products/reviews