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.
Hot: 2001 Estoril M Roadster
ZCP 19's, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's supersports, ZHP knob, UUC short shift GROM, OEM 18's w310's,
http://absolutehid.ca hid kit