Yo mang, I've got both the Comptech SS 4-2-1 header and SS exhaust. The exhaust was loud IMO, especially on the freeway and in parking garages (although I do admit I liked setting off the car alarms - haha). I would rather be able to listen to my music than the loud drone of my B16. So I got the silencer tip and it is now a decent sound level.
Honestly, I didn't notice much gains in mileage, b/c it's really how you drive it (accelerate, etc.) I didn't notice any mileage gains from my 95 EX w/DC 4-2-1 header and K&N filter either.
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