05 Daytona 955i - Flat Spot

Hello,

Just joined the forum and just bought (last week) an 05 Daytona 955i.

Been out for a couple of rides to give it a bit of a shakedown and noticed a flat spot around 5k, it has an after-market can/exhaust, so thinking it might be that.

I know it was a common fault with the earlier models, but wanted to check if anyone else has had a similar problem with a gen 2?

Thank you,
Johnny