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Discussion Starter #1
when I rebuilt my R32 this summer, one of the most satisfying things was to slap in a 3" decat pipe (not particularly legal in my native USA but ok in Korea, for five years until I get smog tested).

well, today I got my first real good look at the underside of my car, and I also happened to have a measuring tape in inches in hand - my pipes are 4"!! From the Mine's downpipe to the Apexi catback, it's 4" all the way - meaning that decat is now a bottleneck :p I suppose it's at least break even though, compared with the cat that was there before.

But...does anyone make a 4" decat?
 
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