Fuel mileage in stop and go traffic in the city with these cars is horrible, even if its properly tuned. I'm lucky to get 400km (240 miles) out of a tank (=12 miles per US gallon) when doing my typical city commuting. On the track its even worse as you get into the boost a lot more frequently.
Out on the highway cruising I get double the mileage that I do around town.
The popping sounds are always there - with a stock muffler you can't hear them but with an aftermarket muffler with no baffling etc. you get to hear all of it 
Never heard of a Kool Vue exhaust system - if you need a great system talk to Brian (RarlyL8), and if you want to go back to a stock muffler I might sell mine as I never expect to use it again.
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Richard
1982 930, K27-7200, Ruf wheels, Leask WUR, Tial WG, RarlyL8 headers & single out muffler, SC cams, TK I/C
2018 GTi, 2011 R350 ski car
2004 BMW R1100S
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