Down on power in 5th

[stevem42]

Need some help please or maybe its me think I was loosing power/speed in 5th

Was at thruxton trackday yesterday coming off church heading towards club down brook lands

coming out of church in 4th then changing up to 5th ( car was either at 6500/7000 or on limiter after exit)

also car accelerating great in all 4 gears

car are just seemed very lifeless in 5th

just fitted decat, induction kit ....could I need this remapped

many thanks in advance

 

[N4TH4N]

Having a similar issue myself but in 4th!