get a ex header and cat. espically if your looking at having a shop do it they will charge more to modify then to just flat out install so get the needed parts. I would still have to say do it your self but if your not mechanically inclined then take it to a shop it wont be cheep though you may be looking at any where from 200 to id say about no more than 400 to install but that only if you get the ex parts need.