I have a Bowling Green Customs elbow with matching 3" stainless downpipe. Will fit under a stock turbo shield w/o having to mod anything. The puck is 1 3/8". You will have to install a stud into the bottom left of the exhaust housing to use this. Same size stud as the inlet bell is used. You will also need an 18" test pipe or cat to fit right. $225.00 + $35.00 UPS ground to lower 48 only.