I had my RE-0880 filter on alone for quite awhile and I can tell you get the Psycotty system. My EGTs are down 100 deg on the freeway also I am running 2-3 PSI less boost at 80 MPH cruise set. I haven't as of yet had the chance to check my milage alone but if what I have read about EGT and boost cruising the milage should be better. I also allowed me to push my #11 TST plate(280 HP685 T) all the way forward.
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The Psycotty is well worth the money!!!!!!!
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Dee'sel
97 2500 Club 4X4 3. 54 LSD 5 speed, K&N Air filter RE0880 & Psychotty,
TST #11 all the way forward, #12 for winter, AFC spring kit,
TST EGT gauge & TST 0-60 boost gauge in A Pillar
Silencer Ring removed, Cat-be-gone, 4" exhaust from down pipe,
Dynomax 4" bullet, Crome 4" turn down, AmsOil 80W-90 in Trans,
Lund WInter front, Leer Cab Level Shell, 235/85R16 Goodyears
NRA/USPSA member and proud of it