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Its all about the driver imo, well the car too but mostly the former. Ive got b14's, decent brakes, engine seems fine etc.
Did a trackday last saturday and rob aka @bob the builder had the same tyres Marangoni semi slicks, roll cage, decent brakes etc. He was quicker than me, although i put...
And the cost? Imo with what you have, tuner 100%. If you had cams etc then obv it would need to be mapped on a dyno. Another thought is why don't you get it dynod and see what it is now? The only issue with that is if he wants the business it will read low
I'm trying to remember what rs tunning got out of my old phase 1. I think it started with 167 and ended up with 174 maybe less. Unless your tunning is out now 10-12 bhp seems a bit much. Or I could be wrong as my memory is crap lol.