Yes my 280whp is on all stock fueling, If I had injectors and fuel pump they sounded like they could have gotten another 20-30whp. Again this was on a mustang dyno. The car actually drives like it has more HP.
The important thing is the car drives great and I expect to be driving it for years.
201,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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