I dunno...i haven't had to emissions check mine yet...it is due soon tho.
If you got axlebacks i got factory manifolds and midpipe you can use/ have. Live a mile or so from air care in castle rock.
Clint at AIR in wheatridge/arvada could tune you to pass...
Also Nick at MAC autosport in Parker
09 G8 GT in Stryker Blue Metallic
Go: Vararam CAI, SLP Headers, ATI 25% UDP, Magnaflow 12468 mid-muffler, PM-FL Axleback & FE3 Shocks N Struts.
Tuned by MAC Autosports of Parker, Colorado
Show: Little Trees US Flag Vanilla Scented Air Freshener; SLP Firehawk wheels...
Best 1/4: 13.969 @ 102.70mph @ Pueblo Motorsports Park
DA of 3921', with an actual elevation of 4662'