first you need to help your self buy letting us no a little more about your car and location.
do you need a dump pipe made?
where do you live?
Mandrel or crush bends?
If you have a turbo and you need a dump pipe. expect to pay from $600+
for the same thing with mandrel bends you looking at $600 + about $30 per bend.
If you dont have a turbo:
If its mannifold back. you'd be looking at around $300 with crush bends
If its mannifold back with mandrel bends you'd be looking at around $500
some people will try to rip you a new one. get a few quots in ur area before you get it done.
offer cash too. since the only cost involved to them its the pipe (around $30 a lengh). everything else is just labour.
sorry lol i read ur first post agen after posting and when i was writing it took me 30 min so i missed all the other posts lol
so theres a rough guide for you. like i said offer cash since they dont need to put it in the books