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« on: 29 March 2007, 11:53:51 »
Regardless of how heavy the car is, the flywheel is reciprocating mass which multiplies the effect. The Omega was designed with an overly heavy flywheel so it could pass emmision/state tests in other counteries, where the idle speed has to be set lower (hence the heavy flywheel to keep the engine turning at low RPM). It also incorporates a dual-mass system, which is designed to aid comfort (ie smooth gearchanging) rather than out and out engine response.
I speak from experience, having owned a 1999 3.0 MV6 manual with the flywheel kit fitted. The difference really is very obvious - it revs much quicker and more freely (whilst on power on the move - not just whilst sat in neutral) and heel and toe gear changes become easier due to the faster response from the engine when blipping the accelerator.
With regards to transmission jolt, yes gear changes become slightly more difficult to get perfect, buy if you're a half decent driver, it takes all of 10 minutes to get acclimatised. Really not much of a problem.
Finally, yes I agree with the comments about the exhaust manifolds. Somebody on 'Bahnstormers had a an equal length stainless tubular manifold made up for his 24V Carlton GSI - at a reasonable cost if I remember right - and good increases in power were noted. I'm currently investigating potential companies to have a set made up for my Omega.