Do I need tune with a downpipe?

[Vikatin]

Hey all,
I have received mixed messages on this. My ECU is locked with my 2021 supra premium.
I just got the FI exhaust and I am wondering if I should get the FI downpipe to match, only that I heard that a downpipe can actually hurt the car if the car is not properly tuned.
Can this be confirmed? Sorry if this was brought up before and I didnt RTFF
Thanks for any knowledge!

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[zrk]

If you go with a CEL-free catted downpipe, then no, you don't. If you go catless, you'll throw a CEL and will fail emissions.

 

[Extreme Power House]

Regardless of the downpipe, you do not need a tune. Most downpipes will throw a check engine light, the car will run fine, it's only a warning.

I recommend you get the Active Autowerke catted downpipe, it does not throw a check engine light.

https://x-ph.com/active-autowerke-aa-bmw-supra-b58-catted-downpipe/

 

[YellowJacket]

Regardless of the downpipe, you do not need a tune. Most downpipes will throw a check engine light, the car will run fine, it's only a warning.

I recommend you get the Active Autowerke catted downpipe, it does not throw a check engine light.

https://x-ph.com/active-autowerke-aa-bmw-supra-b58-catted-downpipe/

Do you see any gains without a tune on any down pipe catted or un-catted?

 

[Extreme Power House]

Do you see any gains without a tune on any down pipe catted or un-catted?

VM Engineering posted a dyno showing that the downpipe adds 20 whp on a stock car

 

[NitroYellowMKV]

you will be fine, you will most likely get a check engine light that you will have to clear every 3 or so ignition cycles, but you'll see about 18-22whp gain from a catless downpipe, quite a few people have already put the cars on the dyno, and maybe get 7-10 whp from the exhaust (maybe) idk, I think I felt a little butt dyno when I did my AWE but it could be placebo. you will be able to tune your car soon, just go catless and once you can tune you'll tune for it.

 

[Thill444]

For me it’s the cost vs the benefit. Adding a downpipe without a tune or piggyback will result in slightly higher horsepower and better sound at the expensive of a potential CEL or warranty denial if you have a powertrain issue.

I personally wouldn’t do a downpipe without a tune.

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