Y-Pipe Install
From http://www.thunderracing.com/index.c...yid=1051#T1424
"LS1 Y-Pipes
Replace your flattened-out factory y-pipe with a new 2.5" mandrel bent one from either Borla or SLP Performance. Both y-pipes are constructed of stainless steel for a long life. 1998-1999 models require welding; 2000-2002 models will bolt in place with factory hardware."



