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I was thinking about ordering a spintech 6441 muffler to put on the back of my on3 78/76. Will i run into any back pressure issues. Its a midmount turbo setup btw.
Any muffler that is not a straight through design will cause higher back pressure. Depending on the specific setup this may not be a big deal. I wouldn't use anything but a straight through "turbo" muffler design personally.