Thing is with my old Scoob it was built for quick spool next to no lag. Thats why James wants the same headers again. Harvey Smith like Jaffa has had them tested with the best & the oe ported one's alway's came at the top for spool or very close. I think only RC one's compared. The people who have been in my old Scoob will know what its like with the 20g H.Smith headers & up pipe. Its a very quick car with bags of torque & almost instant power