I installed JBA's on my 03 and BBK LT's on my buddies 03. Most places charge anywhere from $300 to $800. I've also heard that shops that quoted a good price raised hell when the owner went in to pick up the car. I install headers on mod motors for $300. I don't have any overhead. I drop the k-member for the install and it usually will take 8-9 hours. It's not too hard but a lot of labor. Dropping the k-member makes installation a snap. I think the extra wrench turning by doing this versus working around the k-member is well worth it. Not a single bolt is hard to get to, you can leave the starter motor on and installing the dip stick is easy. Working around the k-member is hell.
It took me about 4 hours total from start to finish and I've never done it before. Reason why:
1. My car does not have a K-Member
2. There is a lot more space in that area
3. Even more space due to a complete A/C delete
4. All stud bolts are easily accessible
5. The exhaust system drops off with 4 bolts
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