Thanks for all the information guys, I will look into Team Leos as an alternative then, and Rally Prep in Cornwall have also told me they have done similar set ups on west fields and caterhams, and they are 10 minutes from me which is helpful. Good to have a few options to weigh up. It would certainly be good to have a better idle as the car really struggles when cold. It's the noise that I love with the ITB's, and I will likely do a cat bypass as well. I know Evo magazine did both those mod's on their Caterham and they said it was instantly the best sounding car on the fleet.