Ehh not very much unless you're gettin on it constantly. Areas in the powerband are noticeably stronger though

 

I have unlimited custom tuning from JJ at Woodbine Motorsport and couldn't be happier with the tunes and customer service. The turnaround for revisions is usually about 3 days and the latest one that I have put down 308 to the wheels, not bad for a lil old 4.6.