Personally I'd leave the cams, they are better in my opinion anyway, and only the intake cams are different from 00-03. Swap the 3.11's for the 3.71's and get an AJ tune. Those will give you the best results, and with the better low end of the deville/SLS/Eldorado cams you'd be faster, although just slightly, than your STS brother, trust me.
doing some post diggint Highline lol
as for the 3.71s with the 275 being faster i still dont trust this
the Bonni GXP came with this set up, weighs nearly 400 pounds less and it still clocks in slighly slower than a 2000+ STS with 3.71 and the 300 hp
Ya it's been a while STS2003, so I have been looking around, chiming in where I can, because anything I recommend I have done. I haven't been in a ton of races with DTS's but the ones that I have raced I have beat. I jump them right out of the whole by a car length and they never close the distance. But I also have a different PCM from stock, much closer to a STS/DTS program than the stock deville/DHS/SLS programs.
My opinion is, the "275 horse" cams get me out of the whole quicker, and the tune keeps them from gaining on the top end. Anybody that lives in the Milwaukee area that has a 00-03 DTS, feel free to pm me if you want to run, for shits and giggles, loser buys the beer, afterwards. Anyway, you'd be impressed what this "275 horse" N* will do, like I said earlier the only difference is the intake cams in these particular years, earlier models there was a much bigger difference, performance wise, in my opinion.
Look for Highline in Northstar Performance and Deville: the newer PCM's don't go in here, and his car is considerably more sophisticated than meets the eye. (You notice that the last post in here was 6 months ago.)
So highline u have a 03 DHS with upgraded 3.71's and a AJ tune?
What would happen if those DTS/STS/300hp cars got the tune?
Im new to the caddy world and im thinking about getting one. Trying to research and learn what options there are out there and which model i should get between a seville/deville/sts/dts.
We have installed "tunes" into a friends DTS and he still lost to me. It was closer but still not that close. In my opinion and experience the cams are better (more radical) in the 275 horse version from 2000-2003 than the DTS. Remember the only difference in these years are the intake cams. The 2000-2003 275 horse intake cams are much closer in spec to the old STS 300 horse intake cams than the 2000-2003 300 horse intake cams.
Now to be fair allot has been done to my particular car since then, allot.
To be honest, assuming you do not have the same modifying sickness I do, you'd probably be happier with a DTS/STS, stock vs stock. If you share my disease, grab a DHS, 3.71's out of a DTS/STS, a W tire PCM program, mine is a modified W program (thanks AJ) and you'll be very happy, oh and while your throwing in the gears, do a shift kit, none available you'll have to ask AJ 'bout the springs, 3500 stall, and build a solid front motor mount otherwise you'll be in every week getting a new one and they are not cheap.
That's a good start, I've got way more done but I want this sled into the 13's next time I'm down to the track. According to the data logs: MISSION ACCOMPLISHED, but I still want timeslips and so does everybody else. LOL