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Discussion Starter · #1 ·
Quick question. Do i need a protune for a catted J-pipe on my 2017 wrx? Only other modification is a borla catback.
 

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Your ECU will need to be remapped for that modification, yes.
 

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Discussion Starter · #3 ·
Your ECU will need to be remapped for that modification, yes.
alright cool. on a slightly different note would you happen to know what changes the protune would have to make to the car in order for it to run smoothy? obviously every car is different but roughly what changes would be made
 

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Entire recalculation of the fueling tables for the change in airflow across the board. Why do you ask?
 

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Discussion Starter · #5 ·
Entire recalculation of the fueling tables for the change in airflow across the board. Why do you ask?
just curious. I've always been interested in what happens during tuning and i wanted to know what would it take for something as simple as a J-pipe.
 

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alright cool. on a slightly different note would you happen to know what changes the protune would have to make to the car in order for it to run smoothy? obviously every car is different but roughly what changes would be made
On stage 2 as you have indicated?

Everything. Fuel, timing, boost control, AVCS (sometimes), and associated comps.
 

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Discussion Starter · #7 ·
On stage 2 as you have indicated?

Everything. Fuel, timing, boost control, AVCS (sometimes), and associated comps.
Well would it have to be stage 2? Mind you the only mod I currently have is a catback.
 

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So basically your overarching question is can you run whatever mod without a tune.

The answer is usually no.
 

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Well would it have to be stage 2? Mind you the only mod I currently have is a catback.
Yes, but aren't you asking about a J-pipe?

I am not afraid to admit I'm a bit confused here.
 

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It is recommended but J-Pipe usually doesn't need a pro-tune. The best thing to do is to add any parts that don't need pro-tune first then add the rest that needed a pro-tune . This way you just do one-time pro-tune. They are not cheap. Also, make an appointment first because once you add parts that needed a pro-tune your car will not run correctly and highly not recommend to drive long distances.
 

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Discussion Starter · #12 ·
Yes, but aren't you asking about a J-pipe?

I am not afraid to admit I'm a bit confused here.
yes but strictly a j-pipe . i guess the more straightforward question i had would be if i had a turbo back exhaust would i need a pro-tune . apparently the answer is yes
 

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The J-pipe is the only component that necessitates a remapping of the ECU. The rest of the exhaust is virtually irrelevant.

You keep using the term "Pro-tune."

There are OTS (one-size-fits-all) ECU calibrations for just the J-Pipe, available from Cobb for example.

Yes the ECU will need to be recalibrated for the J-Pipe.
 
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