Honestly, a throttle body spacer doesnt really do anything for a fuel injected engine....next up in the cold air intake, which will lead to a long debate/argument, followed by intake/exhaust combos.....and still more argument.
The one mod people will agree on is a regear, which is really expensive.
The 3.6 has a relatively flat torque curve that starts out around 150 LbFt at 800 RPM's and climbs to 250 LbFt at around 2000 RPM's. From 2000 to 3900 RPM's it stays flat at 250 LbFt then peaks at about 260 LbFt at about 4200 RPM's.
All that to say that the torque curve is fantastic for normal driving conditions and you will have to dump a considerable amount of money into power mods to see any kind of change or improvement on that curve (especially on the low end).
If you want to tap into what torque is available on the low end, you're best and cheapest bet would be to regear.
Just an example:
The most noticeable, bang for your buck, power mod (short of dropping a Hemi in) is a super charger which comes in at about $5K.
The most noticeable, bang for your buck, mechanical mod (to tap into available power) is a regear which comes in at about $1500, give or take.
[QUOTE=SFRautomotive;11992287]will a 3" body lift on my XJ still keep me LCG???[/QUOTE]
2012 JK 2Dr Crush Orange, 4.56's, 3" on OME frankenlift, 35x12.50x15 MT/R's
Orange Crush Jeep Club Member #55