Is there any BHP increase due to me having a K&N filter, decat centre section and H&S Jap Style backbox?? If so, how much. Never had the car on a RR, so I wouldn't know.

Insurance need to know, but thought it better to ask in the General section with it being more of a "General" query, cos I'd like to know for myself anyway

Thanks,

Andy.

 

10+ horses i'm guessing

 

Thanks.

Andy

 

Depends where you started. I had 272 BHP and just changed the centre cat, it then ran 288 BHP an hour later, so 16 bhp for just that.