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I'm planning on either building my own, or having a custom exhaust built for my '80 GTSi and had a few questions before starting. My plan is to use (2) separate 4" diameter MagnaFlow mufflers (good enough for Mario, good enough for me!), my question id does the 308 exhaust system need a crossover, X, H, etc, pipe to equalize the back pressure? I've read of people using (2) seperate mufflers but don't know exactly how they've done it, so if any one has any ideas or suggestions help would be appreciated. Thanks