the right way to get a car to pass driveclean without cats is:
You can have a midpipe section that's removable to make it easier for yourself.
BTW high flow cats cause very little backpressure and most people can run cats just fine, they just choose not to because they're stupid.
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Hot: 2001 Estoril M RoadsterZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
Fun: 2006 YZF-R6, black, ohlins, pazzo, cat delete, vance hines csone, YEC racing tune