fenderwells.
hey chris depending on the fuel you run... if its methanol, i would go with a fenderwell exit hedder. just so the fumes dont run you out of the car. the opel being a small car with small interior. you would want all the ventilation you can get.so like a lot of other have said on here a side exit fenderwell would be best! methanol is a pain if you cant breathe trying to stage the car!!!!!!