Saying the car is 'not good' outdoors is relative, how is it set-up, who are you competing against and what is your ability like?
I have won numerous races outdoors at my local club with a XXX-4 and indoors too!
But give Ellis Stafford a XXX-4 and you race a XX-4 and I wonder who'd win outdoors?? Know what I mean?
The XX-4 and XXX-4 are totally different cars it's like wanting to put a Ferrari bumper onto a ford fiesta, can't be done - well I'll rephrase that, there's no point in doing it (incase there's any boy racers on here!

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Dan