I continue to hear great things about the Flowmasters. Once I decide on which company I am going to go with, comes the second question. Which setup provides more Low End Torque, SI/DO or true duals? And what diameter pipe is prefered if increased Low End torque is what you are after? Thanks...

------------------
2000 FORD F-150 XLT Supercab, 5.4L 4x4 Flairside!!!

Genuine Steel Step Bars, X2000 Tonneau Cover, California Cruiser Carpet Bed Liner, GTS Bug guard,

 

From what I gather and all the research I have done 2 1/4 would be your best chioce when running true duals. When running the SI/DO setup most run 2 1/2 or 3 inch back to the muffler then usually run dual 2 1/2's out the rear. I am not for sure which would maintain or improve your low end torque. I'm sure someone else might be able to comment on that.

------------------
97 Ford F150 XLT 4x4 4.6L auto, Std cab/Long bed, 3.55LS rear axle, PW,PL, and PM, captian chairs w/arm rests
Sylvania Cool Blue Bulbs, Ford logo hitch and license plate, tinted windows, blackouts front and rear(w/ford logos on front blackouts),ventvisors all around, painted logos on door sills and under hood, 55w backup lights, K&N Filter, custom 4x4 emblems, cup holder/LED mod, 99 F150 Triton V8 emblems, and much more to come

 

All I can vouch for is that I have FM40 true duals 2 1/4 on mine, and I have lost some on the low end, not gained it. I've been told to remedy this all I need to do is put on an 'H' pipe. Keep in mind I have a 3.08 rear, so any increase is virtually wasted until I change my gears anyway. Hope this helps.

------------------
Black 98 F150-XL, 2WD, 4.6L Slappin Windsor Triton, 5spd.,
RegCab, Short WB, 3.08 rear, Air, Rear Slider, FM40 True Duals
Triton V8 Badges, Duraliner Bedliner, K&N, Ziebart, Castrol Syntec
HAWK Plus Bedcap, profile+ wrap-around bug deflector,
Blazer Neon-Blue projector fogs, custom look'n door cracks
Tinting: #4 RearCab & Bedcap Windows, #2 Cabside Windows

My Site

[This message has been edited by defacto (edited 06-12-2001).]