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Looking at getting a decat fitted soon. I was wondering if I will run into any issues with less back pressure will I need a map to alter this or will it be good to go? If anyone has already decatted their 135 I would like to hear your opinions on it.
 

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Only illegal if you intend to drive it on the road in the UK, which to be fair is where most people without a vast estate or regular access to a racing circuit tend to use their cars 🙂. I think certain police forces do random roadside emission testing and the fines from getting caught could be eyewatering. Interesting the article below also mentions maps and presumably tuning boxes would be the same?

 
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