Do you have a local shop that does xhaust? Most of them can make the DP instore for you. Different country but here we have shop that is quite popular with the vw gti/r and audi s3 crowd. They made me a custom 3" DP that goes from the turbo up to the mid of the car. Cost was around $181 US. Shop took around 4h to do it but no need to remove propshaft even.
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