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Pickup tube/back pressure tube location

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Old Jul 24, 2020 | 11:37 AM
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Pickup tube/back pressure tube location
I have an 86 base s4 with a stock na engine and I was wondering where the location of the back pressure tube was on my exhaust. Is it on the cat or is it on the headers?
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Old Jul 24, 2020 | 04:06 PM
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From: https://www2.mazda.com/en/100th/
on a stock car its on the split air pipe, comes from the main cat, small vacuum line
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