Suck it up and buy from seymore4, I hated the cost but now that iv done my exhaust and he tuned everything. I wouldnt have a titan without the cajunbpipes products. Having headers and no tune is like buying half a turbo kit....theres no point unless you buy the whole thing.
Seymore4 is great and very knowledgeable. He does tunes quickly from the data logs and also lets you know if there are any issues (i.e. - he just informed me that my right side exhaust has a leak). Highly recommend working with him..you won't be disappointed!