Ever since my car was stg 2 flashed and the turbo back installed, there is quite a bit more exhaust "gunk"showing on the rear hatch lid. My assumption is that with the less restrictive cat (200 metal cell high flow), it allows for less exhaust to be "filtered out" before the tail pipe.
Can someone please confirm this and/or offer some insight? Thanks.
Can someone please confirm this and/or offer some insight? Thanks.