I've been hunting an issue with my 03 VIII for a long time; it has a recent mail in Dynoflash, the rest is largely stock. The car seems to perform a bit better under half throttle vs 3/4 to full throttle where power goes doesn't go proportionately up the more I push it. The car posts good boost #'s, 18-20psi depending on the air temp & humidity. Accelerating from 65-85 in top gear seems better if I don't push it too much.

Does this sound like a issue with the flash or could it be a limitation of the stock exhaust?