Upgraded Greddy downpipe people
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Upgraded Greddy downpipe people
Anyone here have the Greddy kit on their 99-00 Si with a upgraded downpipe? Im looking to upgrade the downpipe from its 1 7/8 inch to a 2.5 inch but i've heard by getting a bigger downpipe, it makes it harder to hold boost under 10-12 psi.
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