Tuned car, safe to go back to a stock catback exhaust?

[KAREEMMK5]

So I'm tuned on ecutek. When my tuner did the tune it had an intake, p800, catless dp, and a exhaust.
Exhaust is too loud and I have decided to put the stock one back on while keeping the catless dp.
Is it safe to run the same tune or do I need a retune?

Thanks.

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[Thraxbert]

You can do whatever you want with the exhaust, tuned or untuned.

 

[KAREEMMK5]

Cool, thanks!

 

[zrk]

Yup. It's fine.

 

[Axix23]

Should be fine. Possibly more back pressure but I doubt much.

 

[NitroYellowMKV]

now the real question is what spicey exhaust will be coming up for sale soon now haha

 

[Thraxbert]

Should be fine. Possibly more back pressure but I doubt much.

In fluid dynamics, flow of a system is limited by the narrowest point. If his exhaust attached to the stock 3.15" restriction of almost any downpipe, then flow and backpressure is unchanged.

 

[KAREEMMK5]

now the real question is what spicey exhaust will be coming up for sale soon now haha

miltek race exhaust
Barely on for like 200km
Sounded insaaaaane
Brutal downshifts and up shifts and flames everywhere
I loved it but unfortunately the cops didnt and i dont want more trouble

 

[NitroYellowMKV]

miltek race exhaust
Barely on for like 200km
Sounded insaaaaane
Brutal downshifts and up shifts and flames everywhere
I loved it but unfortunately the cops didnt and i dont want more trouble

Shame you are so far Away, I remember when you told me you got it haha. Someone will enjoy it

 

[Axix23]

In fluid dynamics, flow of a system is limited by the narrowest point. If his exhaust attached to the stock 3.15" restriction of almost any downpipe, then flow and backpressure is unchanged.

Stock exhaust isn’t completely 3.15 all the way through, if you look, there are crush bent parts…..

 

[Thraxbert]

Stock exhaust isn’t completely 3.15 all the way through, if you look, there are crush bent parts…..

The downpipe exit is 3.15" and that determines the maximum flow for anything attached thereafter.

 

[Axix23]

Your maximum flow is as good as what your smallest diameter is….. Your theory would work if it you were running open downpipe to no exhaust….

 

[Axix23]

In fluid dynamics, flow of a system is limited by the narrowest point. If his exhaust attached to the stock 3.15" restriction of almost any downpipe, then flow and backpressure is unchanged.

Reread what you just wrote. Flow of a system is limited by the narrowest point…. Lol You gotta be drunk….

 

[FLtrackdays]

Interesting thread @KAREEMMK5. I’ve got a free breathing MX5 as well and it sounds great. But I’ve never heard an exhaust as loud as this AWE track exhaust with catless dp on this MK5 Supra . No tune as of yet but can’t wait to do some logs and send ‘em to Jessie. So opposite of you at this point. Not for sound but for full throttle tracking in some Vietcong style (FL) heat. I went with JB4 just because of my model year and Jessie’s reputation on this forum. I would definitely think it’d be worth it to retune anytime you make significant changes . Just to run as smooth as possible for any kind of driving (and especially not get towed away on track - it’s embarrassing man ).

 

[Sam85]

I told you, you should be fine.

why did you have to start a thread about it?

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