.... Here's what I like, with a 1/16 in. "Hogzaust" gap the exhaust is still whisper quiet at Idle, but any pressure on the gas and the car comes alive. - Sort of a self-adjusting free-flow exhaust, the more I accelerate, the more gasses escape from the gap, at WOT, very loud. By far the most restrictive point in the system is the small diameter tailpipe at the end of the stock muffler, the rest of the system w. header is decent sized tubing so - needless to say, the "Hogzaust" works perfectly on this old Subaru. - With all other mods included, I'm probably pushing, (and it feels like it), around 160-170hp out of this ej2.2, not bad in a lightweight 1996.