with stainless youre leaving out alot of info.
What is your joint design?
What type of stainless is it?
where is it going?
what is it going to be used for?
Just a shot in the dark but, does the customer want it welded using their wps?
If the joint design is open grove youre gonna need to tig your roots, make purge gas dams or get purge gas dams.
If its going to be x-rayed, youre gonna have to use hi-freq starts and if it is and youve never welded stainless pipe properly, you might save you some money and pass this job up.
Stainless can be ruined very easily if you dont know what your doing. Too much heat in the part and youre toast. Man i could go on for hours but, you need to get or provide more info bro.