Clebode, those exhaust boxes can be a mare but theres an easy way to save yourself any hassles. Just open out the slots in the firewall that goes around them. Another good tip would be to add the exhaust last. It makes painting the thing so much easier and all you have to do cut the exhaust pieces in 3. There is a recess to allign them in the box so its no biggie. Also dont forget to scratch a deflector to stop gunk going in your supercharger. Its funny as the instructions all show this piece yet Eduard didnt include it in the kit LOL,
...Guy