long tubes will help top end power, and your peak torque will go up,. the torque curve will also move up the rpm range a bit. fab or having someone make a single tube exhaust. true duals are a waste of materials in 3rd and 4th gens. if you are ever in need of more tubing there are 2 or 3 companies making bolt on kits with up to 4 inch tubing, and i have seen at least 1 car with a custom 4.5inch single run.
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