i have to say the numbers do look, especially on a Mustang dyno. FWIW, when I dynoed mine fully stock (on a Dynojet), it yielded 280whp/283wtq. Going for another pull next month, will do Map 5 (all else stock), then Map 5 with exhaust (catless midpipe and axel back). Will be able to gauge the incremental increase due to JB3 and then the added hardware.
2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Lachssilber on Silver, Dinan S14, 17' BBS rims, stock
2016 Porsche 981 GT4: Sapphire Blue, Factory bits, Xpel, stock
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister exhaust, mostly stock
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods