The extra 'j' bend should not add/be a problem - I have the same setup on my 82 GT with Dynomax Super Turbos. Whereas regular super turbos (in the front out the back) make an 's' bend inside the muffler, the ones I got (in the front out the front) only make a 'u' bend inside the muffler, so - the additional 'j' bend to take it out the side just completes the 's' - without the extra bend having to take it over the axle.
just my $.02
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1982 Mustang GT