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A 'less restrictive' exhaust will not help mpg. The whole idea is to run at low rpm. Not conducive for larger exhaust. Also a less restrictive system would only show a small benefit at wot wide open throttle. How often are you there??????
I had the exact same car 15 yrs ago!
Loved the ride! I did get 28mpg on a 1700 mile trip to Dallas from Sacramento. The trick was to coast engine on down hills and drive 64mph. I did not do any mods.
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