Thats really helpful guys.
Its a very fair / valid point about the engine blowing. The scooby world mapping is custom rather than off the shelf - but I have no idea who exactly would be doing it tbh. They are ecutek ecu authorised (if that counts for anything - I have no idea!)
I suppose another option would be to get the scoobyworld downpipe, ? cosworth air filter, walbro fuel pump fitted and just get Andy F to map it for me?(it already has vortex back box)
What do you guys reckon? Its imperative that the car runs well as its my daily driver - last thing I need is a badly done job.
Thanks again for the advice to the noob!