+1, much better options for aftermarket tunes than Dinan IMO. Recently had work done at a former Dinan rep/shop that dropped Dinan products altogether as they could never substantiate the claimed results, and their clients were left very unhappy.
Steve knows well how to milk the 'warranty' trump card, but read some more on the E90 (and other) boards and you will see how that veil is easily pierced. Many a Dinan customers have been left stranded on the warranty claim...
2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Hennarot, S14, stock
2016 Porsche 981 GT4: Guards Red, LWBS, SC, full leather
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods