Thanks guys.
Been away, dealing with kidney stones :'(
Opened up the exhausts ends. I used a 9/64 (0.36cm) drill bit. Doesn't need to be too deep to improve the look.
I would have to say the biggest kit I've built was the old Revell 1/32 Corsair from the Ba Ba Black Sheep TV show;
The pictures were taken back in 2009 but I built this kit in 1992. I would like to think my skills have improved 110% ;D