Craig...a few observations on the Sigma mods:
Throttle bodies on a standard Sigma gives about 150 bhp....at a cost of about £3500 +....glorious sound but most performance is at top end of rev range..not great for everyday use.
Some people found the noise tiresome after the novelty wore off !!!
Each engine is different and hard to estimate bhp...I would put yours at 137.6 bhp !!!!...joking !!!!..who knows without rolling road test.
I waited for 6000 miles run on my 4/4 before I did anything..gives engine time to settle down and for driver to get used to the car.
I then had the remap...£250..BIG noticeable difference in terms of acceleration right thro the rev band,mid range torque and even mpg driven sensibly.
The standard manifold is crude and strangles the engine as I'm sure you know..the Librands tuned manifold with the sports exhaust was another step in the right direction.
Changed the sound of the car to a deep pleasing boom with pops and bangs if required.
In many ways a much nicer sportier sound than my +4 Supersports.
KN filter with homemade cold induction system also helped..as we all know the engines thrive on cold forced air.
Suspension changes followed to take advantage of increased power and torque:adjustable shocks,panhard rod,brake reaction bars (cheap and effective way of tightening up front end)
Tyre choice is important..the oe contis were not great as a sporty option.
Beyond these mods different cams are available but where do you draw the line and at what point do you change the car for a bigger engine model ??
The choice is yours !!!!!
Thanks for the info Kev, I’ve done the Panhard Rod and brake reaction bars. Manifold will be next then
