So I picked up a 2011 Jetta 2.5 five banger with a 5 speed manual. First 2 tanks have got me just a hair under 35 mpg. My only issue is that the thing is muffled so well I find myself buzzing along at 70 in 4th gear for a few minutes. If I were to put a different exhaust or even just change the muffler to give it a little bit of exhaust note could I expect any change in mileage? Would an intake kit do any good? I'd love to be able to sneak up on 40 mpg, if it's do-able.
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