RE: exhaust. Have to disagree with 2ManyTAs. Log manifolds are a definite hindrance in the midrange+. I hate headers myself, and the RAREs with 2.5" outlets work well! Would love to have long-branches.
I once had a dual exhaust made/put on by a "reputable shop," and I specified 2.5" all the way and even provided the straight pipe. Later, upon inspection, they had used some pathetically restricted bends, especially toward the front of the car: maybe as small as 1 3/4". By the time I went back, they were out of business. So you might want to have a look at yours on a lift.
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