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Overboosting with this downpipe?

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Old 02-19-16, 06:38 PM
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Overboosting with this downpipe?

I Have a downpipe that is 3" but at the turbo it bottlenecks to 2.5". Would this cause over boosting on a stock turbo2 engine?

Overboosting with this downpipe?-image-3006721858.jpg
Old 02-19-16, 06:56 PM
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The reason they do that is because a 3 inch pipe won't fit on the flange and they have to squeeze the pipe at the flange to get it to connect to the Turbo.
Still I can see your exhaust flowing more freely than the old 2.5 inch pipe..so I'd say ya..it is a factor.
Old 02-19-16, 07:04 PM
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Originally Posted by misterstyx69
The reason they do that is because a 3 inch pipe won't fit on the flange and they have to squeeze the pipe at the flange to get it to connect to the Turbo. Still I can see your exhaust flowing more freely than the old 2.5 inch pipe..so I'd say ya..it is a factor.
Thank you !
Old 02-20-16, 10:16 AM
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Yes, it will cause a significant boost increase if the rest of your exhaust is free flowing.

Port your wastegate. It will help considerably, but may not totally correct the situation.
Old 02-20-16, 02:33 PM
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Originally Posted by Aaron Cake
Yes, it will cause a significant boost increase if the rest of your exhaust is free flowing. Port your wastegate. It will help considerably, but may not totally correct the situation.
Thanks. I have a muffler as well that I plan on putting on the car. And soon I will be going to a standalone
Old 02-25-16, 01:14 AM
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I would worry if you had a s4 turbo. The s5 model has less issues, but porting wouldn't hurt
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