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Message: [QUOTE="dsrace, post: 1562269, member: 33459"] yes, my post was based on my personal experience and not on other posts. i agree that the larger turbos require a different driving style. my issue is that i cannot keep the rpms where i want them. not with out risk of speeding tickets anyway. what i mean by that is......when towing my toyhauler with 3.73 gears ( as i listed in my long post above) 65 mph in 6th gear is at or below 1800 rpm's. at that threshold, it would feel like it was lugging and i would see an increase in egts then coolant temps would follow, if sustained. if i drop a gear into 5th then it i'm running 2500 to 2600 rpm at 65 mph, egts and coolant would drop instantly. some may be ok with those rpms sustained but i'm not ok with it for 5 to 6 hrs, as it reduces mpg's drastically. in my case, in 6th gear, it was 72 mph min for pulling a 12'6" tall box especially with gusting winds. if the vast majority of my towing was on or at interstate speeds or with 4.10 gears, then i definatley would've left the sxe 366. even at 35 psi towing the toyhauler, it never exceeded 1200* egts on a 96* day. those were short spikes at 35 psi to top a hill and not sustained pressures. i know one person running the 364.5/73-.91 exh and that seems to tip in 150 rpm's sooner then the 366 towing a similar toyhauler. based on that, i decided to try the 363/68-.91 exh, shooting for a 300 rpm lower spool. knowing then what i know now, if the e99 turbo would've had a little better flow ( my idea of top end ,2200 -2400 ish rpm) i would've swapped the 3.73s out for 4.10 gears, slowed down to 70 mph on the interstate, mild 40 hp tow tune on stock injectors and would've been all i needed for towing a 10,500 lb full profile camper. a lot cheaper, quieter too, as well as best all around for my use. that stock e99 turbo would produce 1 psi at 1200 rpm on data logs. insanely responsive as well, just too restrictive on the top end based on egts....... for my application. at 25 psi, topping a hill, towing the toyhauler, i would see 1300* to 1350* egt's. one thing that i feel i need to include, is that my experiance was with 8 remanned full force diesel hybrid 205/30% injectors. at idle atleast 2 of them were on the edge of bad and 2 more were weak. didn't figure that out until after the swap and that does make a difference. how much of a difference, i dont know. what i do know is that after replacing them with 8 brand new 205/30's that were actually flow tested, from bitteroot diesel, the sxe 363 installed, i was able to tow from lincoln nebraska to mt rushmore south dakota in stockish mode, in gusting winds, and 0 egt or power issues. very happy with this combo with my 3.73 gears. the '95 psd i owned prior to this one had 4.10s and it did make a difference imo. during the turbo swap i changed toyhaulers as well. now 4' shorter but same height and weight, and a bumper hitch now. fivers definitely handle side winds better. when i am able to finally make a trip back to st anthony sand dunes in idaho, that is 90% interstate and that sxe 366 would've shined for that run. [/QUOTE]