CARB LEGAL Options! There is NO bolt in converter for the 1999 to 2005 Mazda Mx5. Instead, on the 99-05 Mx5 the catalytic converter is a welded-in part of the exhaust midpipe. This is the best performance midpipe available for 99-05 Mx5s and includes a highflow converter and built in resonator! Full 2.5" wide in all stainless steel. ALL the exchausts we sell for 99-05 include just the exchaust and not a midpipe (unlike the 90-97 choices). Therefore, if you want to connect the flow from a performance header to your new high flow exchaust, here it is. Great for any normally aspirated, supercharged or turbo Mx5. All stainless steel parts means years of quality Mx5 performance. Has factory location O2 connection... and optional use extra connection in the cat for EGT. Fits exactly as your factory 99-05 Mx5 midpipe! That means it fits with the factory Mx5 header, ALL the Aftermarket headers we sell and ALL the Mx5 exchausts we sell. Warranty: 5 yr.