Fwiw rob, I got stock turbo, redline unplugged and w.w., because of surge...8k trailer. Completely cured my surge and only time u hear turbo is in higher boost. Also, depending don where I'm going, I have the 6637 or k/n Fisk kit on. Also have foil delete.

 

WW did not cure my surge, thus the reason I am having to replace/rebuild my turbo now (although rebuilding my stocker back to stock is not an option I'm exploring BECAUSE of the surge problem). Maybe it's the difference between an 8k lb trailer and a 13.5K lb trailer.

 

Robert6401-
"So really guys, 38r with AIS, is it more tolerable?"



Robert-
I know I mentioned it in the RRE thread, but since I got the 38R put in at RRE, I couldnt be happier. I do have the AIS intake. As Jason mentions,
unless I'm in a relatively high-boost scenario (like, over 15 or so), I don't even notice it. If you're pushing 20+, sure, you'll hear it, but I know you have you have tunes, so you won't be towing at that boost level for a very long time.
I'm sort of a lone ranger cheerleader for the 38R I guess-

Here's a 'real world' test I recently did- see if this helps.

Last weekend I pulled our travel trailer 2 hours north to a campground, then 2 hours back on Sunday morning. Me + wife +2 kids inside the truck.
I have not told my wife or kids that the turbo (or anything else for that matter) has changed.

Towing at 70mph for 2 hours on the way home, at times pulling 12-15 lbs boost, my wife and my son sat in the back seat where she helped him study for a math test for multiplying decimals.

No one ever mentioned any noise bothering them, studying went well, and the kid did fine on the test.

Just my $.02
Mike

Also, just fyi, between tunes, injectors, turbo, etc- I really have to romp on it to get the boost past 20 when towing- it just really doesnt seem to be necessary to acheive speed/power I need. Easier to do unloaded in another tune while playing. I'm not much of a hot-rodder when it comes to towing the RV though. 70 mph is plenty for me.

 

Amen here. If I'm doing something that calls for 20 PSI boost, I can't do it for long without breaking some kind of law. I've had my 38R up to 35 PSI boost and it was eerily quiet in the truck - just before the tires broke loose. Maybe I was just outrunning the noise... or I was getting tunnel-hearing... or maybe my grin was plugging my ears. I'd almost swear my turbo doesn't work, but there's the boost gauge... telling me otherwise. Maybe the noise is in a spectrum I can't hear, but my wife can't hear it either - and we could both hear the stock turbo (only with passenger window down). We get an occasional whistle, but that's it.

 

As far as performance goes, I have no complaints about the 38R - even when it was apparently starving for air (maybe it was just getting what it needed from the CCV ). I had no complaints about noise with the AIS in front of it, but with the 6637 - I find it miserable. My truck regularly sees 25psi when pulling grades at 22-24k lbs GCVW in the tow tune and I have yet to be able to push EGT's into the red with my current tunes! IMHO there are better options than a 38R and Int'l bellowed up-pipes in a similar price range...

I've driven a truck with 250/200's and a GTX4294 that made ~600HP and ran mid 12's in the 1/4 mile and that charger was as quiet as a stocker at all but ridiculous boost levels!! (no, the GTX is not in the same price range as a 38R - but an S366 is plenty for Stage 1 or Stage 2 injectors and it is a rebuildable charger...)