2010 Ford Mustang Speed difference question

38,000 MILES • 5.0L • V8 • RWD • AUTOMATIC
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HAYHALSTR
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Not so much a a repair problem but a buddy of mine has a 2011 Mercedes Benz e550 Naturally Aspirated and its all stock except for a small tune. The sheet says it runs stock 382hp and about torque. I have a 2010 mustang gt with a 5.0 v block swap and an offroad xpipe to muffler delete system. He weighs around 5500 which is a little over 2000lbs more than me. I was wondering what could possibly be affecting his car internally so much as to allow him to beat my cars quarter time by about 1.3 to 1.5 seconds? Thanks.
Sep 7, 2015 at 2:31 PM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
I would be getting a dyno run and seeing if it the specs that you have are accurate, you can get an accurate HP and torque readings then you know for sure what you are dealing with.
Sep 7, 2015 at 8:08 PM
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