Does a 1989 7.3 idi need back pressure ?
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I have 3"downs into a 4" @Y and 4" all the way back ..... check out my pics in my album ..... also put a Diesel Power muffler im running Dynomax , and it sounds awesome ...... put a 14X6" K&N under the hood also ...... you will love the sound and it will make more power and economy too..... im averaging about 17 / 20city/hwy
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