That is what Mogsport were going to fit to my car.....the only problem is that Specialist Components have stopped making it due to lack of interest.
According to Mark at the factory, you can expect around 120 - 125bhp from a standard Sigma if decently run in and regularly using the full rev range. I've not bothered with a dyno run yet but Mike Duncan reckons mine is pretty good for a 4/4 Sport. Cain....have a look at RPM in Perth website....they do a revised filter and air intake taking air from the bonnet side louvres which they reckon gives better breathing. Getting a decent power increase from modern engines seems more complicated and expensive than the good old days......cost wise it seems to be cheaper to replace the engine with a 2 litre Duratec until you add up all the additional stuff that's needed!
