So I got tuned about 8 months ago made 288whp on a mustang dyno car was 2013 Evo x GSR with drop in filter and test pipe back.
I got tuned today same tuner same dyno but different car 2014 Evo x GSR with Ams intake/ uicp/ licp / inter cooler/ hks short down pipe/ ETS test pipe/ invidia q300 catback. Made 295whp...
Really confused to why I only made 7whp more?