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Old 07-25-2017, 11:33 PM   #1
Javi9
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Default Modifying after straight piping

I have a 2017 STI now. It is straight piped down from the downpipe. Do you have to tune the car with each mod you give it?
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Old 07-26-2017, 08:27 AM   #2
Jack
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It depends what the specific mod is. Straight pipes add zero power and 100% annoyance as they sound like an amplified Honda with a hole in the muffler. They don't require a tune as nothing is done to change how the engine is running.
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Old 07-26-2017, 09:41 AM   #3
nofriends
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Quote:
Originally Posted by Javi9 View Post
I have a 2017 STI now. It is straight piped down from the downpipe. Do you have to tune the car with each mod you give it?
Nothing better than an obnoxiously loud car to show people how fast you are.

Do everyone around you a favor and put a muffler on. Your neighbors will appreciate it.
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Old 07-26-2017, 01:08 PM   #4
wrbrexx
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If you straight piped it fully you need to. When you change the downpipe (replacing/deleting cats) you need to tune, catback portion doesnt matter tho
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Old 07-26-2017, 01:53 PM   #5
Jaceracer
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Yes get a tune ASAP if you are without cats. You should have a check engine light on anyway which needs to be removed, or just do us all a favor and put some cats on the thing and do a proper Stage 2 tune.
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Old 07-26-2017, 03:16 PM   #6
lpxltt
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No tune needed.

Also, make sure you rev the car to at least 5k every time you take off from a stop light, otherwise without the back pressure from the exhaust, you might stall.

Oh, and another good tip - to get a better/cooler ride, take a torch to your springs and lop a good 3 inches off of them. The car would look amazing after that, especially with some stretched tires.
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Old 07-26-2017, 03:19 PM   #7
GlarryHoodDIT
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Quote:
Originally Posted by lpxltt View Post
No tune needed.

Also, make sure you rev the car to at least 5k every time you take off from a stop light, otherwise without the back pressure from the exhaust, you might stall.

Oh, and another good tip - to get a better/cooler ride, take a torch to your springs and lop a good 3 inches off of them. The car would look amazing after that, especially with some stretched tires.
Newbies section Douchebag.


Is it straight piped after the downpipe or is from the turbo, meaning the downpipe is straight piped? Catbacks require nothing, but a turboback would require custom tuning.
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Old 07-26-2017, 03:25 PM   #8
subarumod
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you never want your bark to be louder than your bite.

Quote:
Originally Posted by GlarryHoodDIT View Post

Is it straight piped after the downpipe or is from the turbo, meaning the downpipe is straight piped? Catbacks require nothing, but a turboback would require custom tuning.
I also was under the belief if it was from turboback it would need a tuneup.. if im not mistaken, I had a 3in from the turbo without a tune a longggg time ago and If I remember correctly, the power to sound ratio just didnt feel right until it was tuned.
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Old 07-27-2017, 01:08 AM   #9
91 RS RA
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If its been tuned for a Downpipe mod then no, no tune needed.
If it hasn't been tuned for the new down pipe or you have removed cats from then yes you will need a tune other wise you will have over boost and other issues
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