S2 also have the high spoiler, different s/wheel, driver a/bag as standard etc.
The ignitor (ign module) is a black box thats bolted to the top of the head (in the middle) towards the back of the motor
If its not there, you'll see 4 holes where it should of been. S2 have it built into the oem ecu
chassis are the same, wouldnt be ecnomical to change. Rad support panel is different